Hey All !!
I have a crazy 1992 Lumina it is complete with a 3.4 Twin duel cam engine with a Hypertech performance chip. When it runs it runs well! Well here it goes, The fuel system holds a steady 40 psi. It cold starts good, when I first got the car it was coding the co2 sensor found that the wire was broke and repaired it this cleared all of the corresponding codes that it created except one Idle speed I adjusted the idle and cleared this. But here is the real kicker once the car warms up to operating temp. it dies as if the key was shut off you can even drive a couple of miles before it quits then bleed the pressure from the fuel rail and the car starts right up but if one attempts to accelerate it will die and the process starts all over again I considered the fuel pressure regulator but one would think that if it was bad it would just simply not function at all rather than part of the time. I have changed the temp Sensor I was told that it is controlled by the ECM and would cause the car to over feed with fuel due to the warm up idle controls in the ECM and cause it to consequently vapor lock the engine so with no codes and this intermittent issue I do not know what to do I even checked to see after it dies and restarted that the exhaust was flowing well and it seemed fine thought maybe a converter issue. By the way the car will set in the shop and idle as long as it has gas and runs like a new engine. I am about ready to take it on a suicide run and it has a new fuel filter just to rule this out. I wonder if the chip or ECM is killing the car??