I have a 95z28 The car is an automatic. I have just had the the tranny rebuilt recntly. About a week ago the tranny had no 3rd gear. It would go 1,2,4 in od. When you put in D it went 1,2 never went to 3rd or 4th. I took it back to the tranny shop they pulled the tranny said it was not that. They told me the pcm unit was bad and was causing the problem. If anyone could tell me if this sounds right it would be greatly appreciated. It is very frusterating. Oh they said it was running rich as well because of this.thanx alot- adam