43 psi fuel pressure when cranking, drops to 38 later. Has spark. New fuel pump, fuel filter. Owner is stumped. I was thinking the module. But then again, it would it have no spark at that point, right? I am going to take my scanner over and look for codes, but I am thinking it may be the opti-although they didn't speak of any of the "classic signs" of one going out.

 

Look for injector pulses. Or squirt fuel in the intake while cranking.