won't idle?
 

Ok guys I finally put my transmission back into car and was able to now drive the car back and forth however despite no hesistation starting the engine will not idle at all.?? I had a mail order tune done to compensate for my non stock mods which include LE1 heads, GM hotcam, LPP longtubes and full exhaust etc. So where do I start to diagnose what is the issue? I've had this car sitting for 4+ years and just recently decided to get off my As* and fix it however I feel like I forgot everything I once knew about LT-1 stuff.

check for vaccuum leak. I know on my ford escort had a vaccuum leak and i had to stay on the gas to keep it going.