Hello, I have a 1990 firebird formula 350 with TPI. It turns over but won't start... It just started doing this.. Before it would start but i would have to have my foot on the gas to keep it running. I checked the fuel pressure and it is good and i checked the TPS and it is good also... Also it wouldn't start before and i took the air filter elbow off from the intake and it would start like it wasn't getting enough air but now it won't even do that.... Any idea would be awesome!!! Thanks in advance!