☰
GET A QUOTE

Q: Rough to no acceleration and misfire

asked by on October 03, 2016

My truck starts and idols just fine besides it sounds like a diesel from a bad knock or tick. Low speeds below 15 mph it seems to run OK. When accelerating it feels like it is bogging down with very little to no power. Most of the time when it does this the RPMs also rise without actually accelerating any faster. If you stay on the Excelerator while it is doing this it sounds like a backfire over and over again just not as loud as a Becvar normally would be. It makes no difference whether it's hot or cold Outside it does the same thing. Last week it would not accelerate past 25 mph at all so I change the mass airflow sensor and it seem to help I can drive it now but is still very. Whoever owned it before is did not take care of it at all. We have changed all fluids, MAF sensor, brakes and rotors, flipped the body lift over that was installed upside down, battery and changed one wheel bearing. Also have run many different fuel cleaners and fuel system conditioners. Thank you

My car has 128000 miles.
My car has an automatic transmission.

Recommended Services

Ignition Coil Replacement $132.12 - $587.62 Get a Quote
Car idle is rough Inspection $94.99 - $114.99 Get a Quote
Check Engine Light is on Inspection $94.99 - $114.99 Get a Quote
Or For Any Other Auto Repairs Get a Quote

It is possible that one or more of your spark plugs or ignition coils have failed. The spark plugs and the ignition coils make up the ignition system and this system is responsible for burning the fuel. If the fuel is not being burned properly, the engine will not run well at all.

I would recommend having you ignition system inspected by a qualified professional to determine if the truck is in need of a tune up or if any of the ignition coils have failed. These symptoms are likely associated with a Check Engine Light as well so checking the trouble codes will aid in the diagnosis of this issue.

Ford
ignition system
engine idle
2004
F-150
V8-5.4L
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car makes noise when turning or slowing down
Hello. Depending on what the noise sounds like would tell me different things. I know that the most common noise I have had on this vehicle is a clicking noise (https://www.yourmechanic.com/services/loud-clicking-noise-when-i-turn-the-car-inspection). Most of the time this noise is from a...
Read more
Fuel gauge stopped working and now gas tank won't let me pump more than a few gallons at a time.
The refueling problem is due to the fill pipe in the tank. The fill pipe has a smaller hose inside of the larger pipe which keeps you from overfilling the tank. If someone tried to siphon fuel from your vehicle...
Read more
Ping noise and jerking when the car idles
My guess is that the noise you are hearing it the timing chain (https://www.yourmechanic.com/services/timing-chain-replacement). These engines are well known for having problems with the timing chain, camshaft actuators, and solenoids. This problem first starts out as brief rattle noise upon...
Read more
When you start off it bogs down and then takes off?
This sounds like potentially a fuel delivery or air regulation problem. There is a sensor in your truck called a mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) which regulates the flow of air into the engine allowing for the proper air/fuel mixture...
Read more
Audi a1 glow plug light come on then goes offi
Hi there, thanks for writing in about your Audi A1. If the light is coming on that often then there may be a particular filter issue. I would need to scan the computer to see what codes are present. If...
Read more
Difficult to turn my steering wheel to the left, but not right
Hi there, The description you have given of the steering being hard to turn in one direction, leads me to believe, the rack and pinion is at fault. The power steering pump failure, would make it difficult to turn in...
Read more
Tire rubs against inner fender well.
The damage to the lower control arm bent that bad would cause tire to hit fender. You may have also damaged spindle, strut, tie rods. You will also need alignment after repairs are done to make sure it is in...
Read more
I was driving down the road and lost power. Stepped on the gas and the car wouldn't accelerate, but didn't rev up either. Got back home on idle.
Sounds as if the throttle pedal position sensor is not responding when stepping on the gas pedal. Try turning on the ignition key to the 'ON' position with the engine off and step on the gas pedal to the floor....
Read more
White smoke from exhaust cold start up
Hi There, Generally, a white or gray colored smoke (https://www.yourmechanic.com/services/smoke-from-engine-or-exhaust-inspection) is a sign of a potential blown head gasket. A blown head gasket can cause a bit of a vapor to be produced due to the coolant being leaked into...
Read more

Related articles

The Best Used Cars to Buy If You Live in the Country
Living Living in the country is a whole different way of living. You deal with rough and uneven roads, mud, snow, rain, and ice and you need a vehicle that can stand up to these kinds of conditions with ease....
Read more
Symptoms of a Bad or Failing Idle Control Valve
Common signs include irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling.
Read more
Top Five Selling Cars in Colorado in 2012
Colorado Colorado offers a varied climate depending on where drivers are located. Those in lower elevations see plenty of sunshine all year, while those in the mountain areas can see as much as 300 inches of snow. Due to this,...
Read more

Browse other content

Estimates
Cars
Services
Cities