Skip the auto shop - Our mechanics make house calls

Q: Engine chugs while acceleration

asked by on

My truck sounds like it wants to die when I accelerate while in gear. It idles and revs up fine while in park. I changed feul filter and added sea foam n it improved but still had issue n is now back to way it was. Checked feul pressure n it was good.

My car has 170000 miles.
My car has an automatic transmission.

A: While adding sea foam and replacing the fue...

While adding sea foam and replacing the fuel filter are very good services for your truck, I wouldn’t expect them to fix your issue. Usually, this is a sign there is something binding in the drive train or wheels. There could be a frozen brake caliper or maybe the emergency brake is frozen. I would check this by raising the vehicle and spinning each wheel to see if something is bound. The same thing can be done with the drive train, with the transmission in neutral.

Aside from that, I would inspect the MAF (mass airflow) sensor. They can get dirty and cause many strange symptoms with fords.

There is one other thing that I am wondering about. When you rev the motor in neutral, will it rev all the way to red line, or does it stop before it red lines? It should do this fairly rapidly. If you floor it and it is slow to rev to red line, I suspect you have a clogged exhaust system. You can also check this by feeling how much air is coming out the exhaust pipe. There should be a strong exhaust stream when you rev it up. If the flow isn’t significant, suspect a clogged exhaust.

If you have a clogged exhaust, the main suspect is the catalytic converter.

If you should still need help with this, a YourMechanic expert can come to your home or office and diagnose the slow acceleration issue.

Good luck!

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: Car engine won't turn over

The most likely cause of this issue would be bad gasoline in the tank. If the fuel in the tank is the same as the last time it was driven, it may be a problem for the vehicle. If the...

Q: Lack of power and fuel smell

It sounds like you may have a clogged catalytic converter. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this causes these gases to be...

Q: Oil burning off 1 1/2 quarts every 200 miles

Hello there, thank you for asking about your 1994 Isuzu Pickup. For your vehicle, minimum compression is 114 PSI and all cylinders should read within 70% of each other. So, according to your results, compression is good. My guess is...

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 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...
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.