Skip the auto shop - Our mechanics make house calls

Q: Hesitates and jerks

asked by on

When taking off if, there's any hill it hesitates and jerks. Once I get to 30 to 40 MPH, it stops for a minute. No smells. I did smell a gas smell today a little. If the car is in park, it idles fine for the most part.

My car has 76315 miles.
My car has an automatic transmission.

Hi there, thanks for writing in. I’d be happy to help.

This is a common sign of a faulty mass airflow sensor or throttle position sensor.

The mass airflow sensor regulates the amount of air that is mixed with the fuel prior to it being injected into the motor. The throttle position sensor monitors the position of your foot on the pedal and relays this info to the computer which then directs the fuel injection system as to how much fuel to supply. When either of these is not working properly, this causes an imbalance in the air/fuel ratio being injected into the motor which is what causes the jerking and hesitating you describe.

If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect and diagnose this issue for you, and make any repairs as needed. Hope this helps and best of 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: Are the front driver and passenger strut assembly parts the same for the 2008 Buick Enclave?

When I look up the strut assemblies parts on this vehicle the left and right struts use the same part number. They are the same.

Q: My Transmission is acting up.

Check the transmission fluid and see if its full and red in color. Fill the transmission fluid up if its low on fluid and see if the issues go away. If the fluid is full and red in color, then...

Q: Ignition problems with car.

Your issue might be low battery voltage. When your crank your car, the starter draws amperage from your battery. Once the car is running, the alternator recharges the battery and gets it ready for the next start up. Things like...

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 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.