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2007 Chevrolet Impala 3.5L LT 4dr Sedan

2007 Chevrolet Impala
Trim Info:
Front Wheel Drive, 4 Door Sedan LT, Large
21 mpg city / 31 mpg hwy
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June 12, 2013, 10:43 am

Maddy M
 

Question: Acceleration on take off

Hello,
I have a 2004 Chevy impala LS 3.8 with about 150K miles. If I am at a stop light or at a dead stop and then I accelerate to take off the car will jerk. I am not sure whether to describe it as a jerk, a hesitation, or a slip. When it happens I always immediately take my foot off the peddle and then I reapply my foot to the peddle to give it more gas. When I do that, the car accelerates fine. This has been happening on and off since January of 2010. It is happening more frequently now and the other day the "jerk" was quite intense. It only happens after I have been driving for a while and the car has had a chance to warm up. I have not paid attention to the RPM’s when this occurs because it always happens when I need to be watching where I am going. LOL

I really appreciate any input!

Maddy


June 17, 2013, 10:57 am

Richard W
Expert Mechanic

You could have a few things going on. The Mass Air Flow sensor could be causing it. The ignition control modual could be causing it. You say it does it more when it's hot. So that is why I would have the ignition modual tested. But you have to go it hot. The last thing it could be is your throttle postion sensor.


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