Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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the most common issue for this is the idle air control motor on the throttle body. if you have to move the accelerator pedal. it s an indication of the position being wrong with the idle air control valve.
is the check engine light on???
I would remove the idle air control, hook it back up outside the throttle body and cycle the key to the on position and see if the pindle on the end of the motor moves
check the passages in the throttle body to be sure they are clean where the idle air control goes
can you verify tps voltage with key and engine off???