[formula350]

I have a 1990 GSX. I bought it knowing it needed work and I was told it had bad compression and a bad head gasket because it would overheat. The compression is 130 across the board. We replaced the headgasket also and did the timing belt while we were at it. The car took about 15 min's to get started when I bought it and it ran sorta rough until it warmed up. It would never boost which we figure was because of the cracked waste gate and that the turbo pretty much was falling apart since who ever touched it before didnt tighten many bolts on it. We installed a rebuilt turbo and a different waste gate. She cranks but it will not fire. It sputters a bit after a good 1/2hr of periodic cranking but nothing more than that. We asked one guy we knew and he said it maybe the injectors or fuel pressure regulator. I have now replaced the injectors and the fuel pressure regulator and still the same problem. We have spark and the fuel pump is working correctly so now Im out of ideas.