I have a 1995 z28 and I just rebuilt the lt1 and put a rebuilt 4l60e with shift kit in. The motor has some bolt ons like cam, long tubes, no egr, no air pump, no a/c. I had pcm for less tune the pcm. The car was idling pretty good from the get go but it would not kick down like it should when driving. The guy from pcm for less told be that the tps controls that and probably should change it. I changed the tps and now the idle is between 1500 and 2000. The car wont shift gears until it hits 4000rpm. If you leave off before 4000 the car acts like its in neutral until it hits the last rpm it was at before reengaging. The idle is now surging a couple of hundred rpm when in gear and in park. I changed everything back to original and it stays the same. It sounds like a vacuum leak but I didn't unplug anything. If anyone knows how to fix this please let me know. Thanks

 

Guess you missed the note indicating that you should not post on this forum. Also, should not post the same topic on multiple forums.