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・Fair and transparent pricing

Get a quote

What others are asking

Q: Stalling problem

Hi there: Although it's nearly impossible to diagnose a problem remotely, it appears you might have more than one issue going wrong with your 2004 BMW. The loud noise and lack of performance is a pretty good indicator of an...

Q: Front brakes lock up is that the ABS module or the pump

The ABS system should of been put into bleed function when bleeding out the brake lines or you may not be able to get all the air out of the system. This is most likely the cause of the rear...

Q: Idling very rough after I bought the vehicle.

Hi there. First check for any vacuum leaks. A small vacuum leak will cause the engine to raise up in throttle, but a large vacuum leak will cause an engine to stumble. Check the fuel injectors and see if they...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.