lets see if you guys can help me out.
friday night I went to the track and put some race gas (112) in to be safe even though I am tuned for 93. I did 2 runs with no problems and didnt run the car anymore. well on the way home it seemed like it was starting to stutter under boost above 14 psi. then by the time I got home it was doing it at about 10 psi.

so today I filled up with normal 93 to dilute the little race gas that was left to see if that was the problem, but it still did it. so then I changed the plugs, but its still doing it. I am stumped. it does this at middle to higher rpms, not really in the low.

could it be a boost leak? vacuum leak? O2 sensor? combination of those? please help.

thanks

 

Oh yeah, I have an LT-8 with 3 bar map sensor.

 

anybody? I know its something related to the race gas. could it have clogged an injector with some lead?

 

I would make sure none of your vac lines melted. If the ECU is getting a bad reading, that could make it act wonky.