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.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: 1994 Ford Ranger - the clutch pedal / master cylinder attaching bolt detached.

Hi there. The bolt would most likely be a metric bolt. Get a metric thread gauge and check the pitch of the thread and measure the width of the bolt with a tape measure. This will give you the dimensions...

Q: I had to replace the upper sprocket on the timing belt , car still won't start . Is there anyone who services this at home

Hi there. You can contact our service department to ask them about setting up a car is hard to start inspection - click here to book first. This is probably the best way to have a professional mobile mechanic come...

Q: Rough idling, check engine light on

First have an experienced technician, like one from YourMechanic, look the vehicle over and read the fault codes from the vehicle. The trouble code may unveil a problem causing the rough idle. Otherwise make sure the maintenance has been kept...

Related articles

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...
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.