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: How long can I leave my truck sitting without it being plugged in before the diesel starts to gel up? Its currently 15 Degrees

To be blunt, there is no specific number that we can give you. You have to understand that diesel fuel gels in colder climates due to the amount, and types, of paraffin wax that is used in the manufacture of...

Q: Code no part

Claimed by Jay Safford

Q: My 98 mustang will stall out in 45 seconds consistently and start right back up.

It sounds like you may have a fuel supply issue or potentially a faulty idle air control valve. If this happens at lower speeds or at idle, this is typical of a bad idle air control valve. If this happens...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.