Check your ignition relay, the relay powers up INJ 1, and INJ 2 fuses, which send power to the coil packs. I think you need to go back to the basics and check all power and grounds. Do you have a scanner of any type that sees engine speed while cranking? THis will tell you if PCM sees input from the crank sensor.

 

I had the same problem.

Luna basically explained the problems with mine to you: The Crank sensor must've gotten hit, because we replaced it, thinking it might help. Ultimately, it was the Coolant sensor (engine temp sensor) that the wiring had been bumped loose on. Nothing looked bad about it, because I had replaced it and it was visually perfect. However, the actual connection inside the sensor wasn't perfect and the car was reading -38 degrees, which wouldn't let it get spark. My buddy works at a Chevy dealer and they used their big scanning tool to diagnose the problem. As we wiggled the wire with it attached, the temp would go from -38 to 16 to 76 (which was the air temp that day). And after getting those wires to fit in more snugly and replacing that crank sensor as well, it fired right up.

Hope your problem is as simple and you get it started soon.

 

my coolant temp sensor read 400* before and it still let me spark... odd....

 

any update?