This morning when I went to start the car, it just turned over and it wouldnt fire. It did this about 4 times and then it fired and ran fine. I shut it off 2X during my trip after it was up to operating temp, and it ran just fine. I let the pump prime for ~5 seconds every time I tried it when it wouldnt fire. Is this the sign of a bad fuel pressure regulator? It has started hard 2 other times, but never this bad. This is just a bolton car, 99 Z28 M6 with 79,000 miles.

 

Hooked up a FP gauge today, it holds at 60+ PSI while running and at KOEOFF. Any hints? Crank sensor maybe? Fuel pump?

 

Well it did it again, but this time the car was warm. It started fine when it was cold, drove it about 5 miles, shut it off for 5 minutes and it wouldnt start, took about 7 key cycles to get it to fire.

 

Any advice for this? Cam sensor possibly on its way out? I put in a new pump and regulator and it has done it one time out of about 10 starts. Thanks.