ok so i have an 98 beetle 2.0 auto. trans will periodocally shift into 4th gear, but drop below 60mph and it downshifts into 3rd. also when slowing down it downshifts hard into all lower gears, at about the highest rpm it would shift into the next upper gear. now it wont shift into 4th, and you have to hit high rpms to upshift. could this be the transmission control module? none of the gears slip in fact they all pull just fine.come on all you new vw gurus...HELP!!!