Question about 2003 Chevrolet Impala

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My 2003 Impala 4.3 engine is running by itself down the road without even a foot on the gas feed and do 60 mile an hour.. Then will run like that idling too. Have replaced oxygen censor valve. No one has been able to figure out what is going on.

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It might be your throttle position sensor or your map sensor

Posted on Jul 29, 2010

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Posted on Jan 02, 2017

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My question: what can cause the car to do this?


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Your fuel pump is sticking and not pumping, this is common if you run the fuel down to less than 1/4 full, the fuel pump needs the gas to cool itself, below a 1/4 tank the pump is not getting cooled and after repeatably running low on fuel it overheats and fails. Running the car near 1/2 tank extends the pump life to many years more than running tank below a 1/4 full..

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