biggb

i have a 99 z28 with an a4, the trans is having some serious issues, in 3/4 it acts as if it is slipping or a super high stall speed. it constantly acts as if it wants to downshift.. if you pull it into 2nd it is a non issue whatsoever, now here is the tricky part i guess, if you go w.o.t it is fine, and once your into a higher mph range it is not there, say around 55-60 mph, even if your 75% throttle like coming onto an on ramp it is fine, its only when just cruising around town from light to light...if you fight through it ,eventually sometimes it will kick down and actually go..any things to try or check here, before i stick a fork in it? hope im not confusing you guys as i am confusing myself, please help..xmas is the wrong time for this to go south, especially after i just order all sorts of other goodies.. the car currently is all stock except for a slp lid/bellow/fliter ,thanks