My 88 Iroc 305 TPI has problems starting. It cranks for a while then starts. Sometimes shorter, sometimes longer. Can't find any common ground with the occurances. So I took it to shop for a fuel pressure check. They said when you first start cranking you get around 10 PSI and then when the car starts you have 40 PSI. Then he said i wasn't getting enough voltage to the pump and that there was a code 54. The car always starts just it takes a little while. So i figured, what's 15 bucks and bought a new fuel pump relay. Didn't fix the problem. The pump sometimes stays on for a long time after the car is off. Sometimes hours after. havn't checked for this since the new relay. My dad thinks it may be a faulty ecm. I hope not. Anyone had this problem? Any ideas on how the diagnose it?