Transmission Problums

I HAVE A 2002 GRAND AM SE WITH A 4 CYLENDER AND IM HAVING TRANY OR COMPUTER PROBLEMS. WHEN IM DRIVING ON THE FREEWAY THE CAR WILL NOT GO INTO 4TH GEAR AND WHEN IT DOES ITS ONLY FOR A FEW SECONDS AND THEN STAYS AT 3RD AND GOES TO 4 THEN JUMPS BACK TO 3RD WHAT IS THE PROBLEM IS IT FIXABLE????? :uhoh:

This can be caused by many thing, Such as low fluid levels, driving habits(such as a heavy foot). Computer glitch(even faulty TPS) sometype of valvebody or overdrive damage. Your best bet to find out which one it is will be to bring it to the dealer if its still under warranty or have a tranny shop check it out. Good Luck.
John