my car will not shift into gear on 2003 Pontiac Grand Prix GTP

usually happens when the car has been sitting for awhile, like overnight or at work all day. starts right up i can put it into gear, any gear, but it will not move. then all of a sudden it jerks and goes.

Asked by for the 2003 Pontiac Grand Prix GTP
the filter in the pan could be clogged. have the trans flushed with a new filter and fluid.

1 more answer
i had a problem like that it was a small engine in your per shfit thats tha stik that you move into gear