1995 z28 lt1 6 speed will crank over all day and not start. New fuel pump, relay, filter, has 38 psi pressure. New opti spark, ignition coil, module, switch. New air charge temp sensor and throttle position sensor. I'm stuck. Going to try out spark tester tomorrow. Any other ideas would be very much appreciated

 

If you're getting spark, get a noid light to and see if the injectors are firing. Also check fuses for the injectors, should be 2 7.5 amp ones. Fuel pressure with key should be 41-47 psi but 38 is pretty close.

I'm not sure if there's a way to test it, I honestly don't remember, but the wire harness going to the opti can cause the problem as well.

 

have you tried squirting some gas or starting fluid into the throttle body intake to see if she will run for a second?

 

Vats ????