Hi all,

Driving an 09 Cobalt SS, Injen upper and lower charge pipes, ZZP Intercooler, Injen cold air intake and ZZP catless Downpipe.
I just got tuned at ZZP and my car was running great. Now, today, it's throwing a cylinder 2 misfire code when I punch it.
It runs great til about 15psi then it sputters like no ones business, but it still idles fine. I'm going to get a hold of ZZP on Wednesday or Thursday after the holidays to see what they think.
Any suggestions would be appreciated!!

 

Anyone? I switched the spark plugs in cylinder 2 and 3 and nothing changed

 

swap the coils in 2 and 3 or 4

 

I'm going to swap the coils from 2 and 3 this week.. It's kind of intermittent... Like, one pull it'll hit 23psi and have power w/o misfiring. Then I'll pull again and it'll misfire everything above 15 psi.. I'm not sure if it's maybe not getting enough fuel or what.

 

Plug gap?

 

I switched plugs 2 and 3, and cylinder 2 still intermittently misfired. The plug gaps looked good. I did find, though, a ****-ton of black soot all over cylinder 2's coil boot and inside the valve cover wall...