After driving about 40 miles my Pontiac firebird 1999 shifts gears choppy when accellerating from stop. why?
I have a pontiac firebird 1999 automatic transmission. After driving about 40 miles and I
make a stop (like at a stop light ) and then put my foot on the gas my car shifts gears
choppy instead of smoothly like before. It's normally the first shift and then is ok, but
continues every time I make a stop. I've asked my mechanic but he is unable to figure it
out since he is unable to experience it when driving (since it occurs around 40 miles of
driving ). Any ideas on what it could be?
I have a new fuel filter, cleaned my throttle body, new liquids etc