So my friend has an '01 with the big FFS kit installed. Eaton MP62, 5,6 injector, fuel rail, walboro 190? pump. Since the install, he's always had some issues, high idle, running rough, etc. Such is the way of modification. We've slowly ironed out a lot of the wrinkles but this last one has been giving me hell.
When the car is cold, it'll start up just fine, the idle's still a little higher than it should be, but not terrible. After driving normally for 10-15 minutes, and turning the car off. you can not get it to fire up. It will turn over, but not crank. It does not cut off while driving.
Main relay, fuel pump relay, cam sensor, and crank sensor are all brand new. What is the next thing to check? It has to be spark or fuel related correct?
Guess I could check the coil pack/ pull the plugs and look for spark on all cylinders. Anything else that could heat soak and kill the car?