I have a 95 turbo. The problem that I am having is when I start my car it suddenly stalls. It did that once before I put on my single turbo, but then magicly it started up and ran fine. My check engine light came on after it started up, which was "mass air flow circuit." Now it stalls suddenly and the check engine light is no longer on. And now when I turn the car to the on position I hear a hissssss noise from the IAC valve. Or is it the fuel by the injectors? Not sure though. I did convert my fuel pump ecu to the 12volt mod, but I did that a few weeks ago and never had a problem since. Please help me.