Hello. I have a 08 cobalt ss/tc and when I bought it a few months ago the guy said it is tuned for e85. Well the other night I was doing 3rd n 4th gear pulls and when I did the pulls in 4th When I hit 5k the engine reduced light came on n the boost fell to about 10 to 15 and it usually runs about 25 to 26 psi so I didn't know if anyone could help me out on why it would be doing that.

 

Codes? Did you have the tune verified?

 

boost leak.

 

I'll check the codes when I get off work and put them on and no I haven't got the tune verified because I haven't found anyone in my area that tunes cars.