im currently having kind of the same problem, but i know the problem. my tune is off with my 60# injectors and IAC tables for the Northstar TB. But i can get mine to start and drive, its idling and starting.
LTFT is showing -12.5 to -15% at idle its pulling tons of fuel. i have to add some throttle to start it, i did have it fixed partially by drilling a hole in the throttle plate to compensate. PCM has learned and its back to the same problem.
Do you have stock TB? if you put your foot on the throttle and try and start will it start?
