Damn gremlins. HELP!! Options

[sleeperdsm]

Okay guys I got a stumper for ya! The patient is a '90 Talon TSI 2WD. About a month ago, the car began having a problem running. She would start, idle about 2K for 10 seconds, and then idle real rough until she died.

Had it towed to Mitsubishi and was told it was the gaskets for the intake and the fuel injectors and they wanted 800+ to do the work so my cousin and I said hell with that, and did it ourselves. While we were at it, we remove the Air conditioner from the block, and cut the hose that ran to it. Had very little problems but even with new gaskets, she does the same thing. Will run ok for about 10 sec then she will spit and sputter to death. She has an aftermarket boost guage and we arent reading any bosst on either that guage or the stocker boost guage. I didn't know if a vacum leak could cause this much trouble, but as far as we can tell, everything is run where it needs to be, or is properly capped off. I wanted a 10 sec car, but not one that only runs for 10 seconds. Help guys!!

[dualdj1]

Obviously if you have a spare ECU to try, that's the way to go. However I'd still check your vacuum lines real well, that could cause an idle surge on start, and then the ECU would try to compenstate