I've got a GTA with the 305 tpi and MAF setup. The car starts and runs great as soon as I turn the key when the engine is cold. However, when the engine is hot it will crank all day and not turn over. The only way it will start is if I hold the accellerator to the floor while it cranks. Once I get it started this way it runs fine again. I was wondering if it could be either a fuel pressure regulator or bad injector. Any suggestions?

 

Yes, it could be either. Remove the FPR vacuum hose and monitor the port for fuel leakage. If there is no fuel leaking from the FPR, injector(s) leakage is suspect, but verify that with a fuel pressure test.

 

My V6 3.1L was doing something similar to that. It was 2 bad injectors