Skip the auto shop - Our mechanics make house calls

Q: Rough to no acceleration and misfire

asked by on

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.

A: It is possible that one or more of your spa...

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Airbag on/off key switch is missing. Need to know if airbag is active or not.

Hello, thank you for writing in. If the switch is missing, and the electrical connections are not jumped (connected to each other without the switch in the middle), then the airbag circuit is open and it will not be active....

Q: Locate master reset button on top of motor

Hello. The only sort of reset switch equipped on a Ford Expedition would be the fuel pump inertia switch. The purpose of this switch is to cut off power to the fuel pump if the computer detects a harsh impact,...

Q: I start the car when it's cold. It starts normal then almost dies then returns to normal idle. Now it hesitates on acceleration.

Hi there. Check the idle air control valve (IAC) and see if its working. The IAC is designed to make the engine run at idle in all climate conditions. Also, check the mass air flow sensor (MAF) and see if...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...