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

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: Transmission slip

The transmission slipping is not due to the fluid unless it has leaked out. The slipping is due to the forward clutches inside the transmission being worn out and not being able to grip any more. Your transmission's front pump...

Q: it has a misfire when at slow speed

If the symptom seems to clear up at higher speeds, this may be related to the idle air control valve which monitors air/fuel ratios at idle an lower speeds. This is a unit that is located on or near your...

Q: Need car checked out before replacing transmission.

If the transmission is slipping you may simply have a low fluid level. I would recommend checking the fluid level as the first step. If the fluid level is low have the system topped off and see if anything changes....

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...