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anyone please

Fujita F5 CAI, ZZP ceramic header, ZZP 2.5 Downpipe, GMPP Sport exhaust, 60lb injectors, 2.8 pulley, NGK iridium 2 steps colder, and gm shortened belt. on 2006 cobalt ss/sc

I am getting a Random engine misfire P0300 and P0130 HO2S Circuit Sensor 1
I think by the looks of my scans my oxygen sensor is messed up. I Have 60 lb injectors 2.8 pully intake full exhaust with...

when i go over 5000 rpm in 3rd gear my boost goes down to 12psi how do I disable bleeding boost with hptuners.

i took my car back to the dealer and aparently one of my injectors went static and got stuck closed, new injector installed problem solved :)

well i changed my spark plugs to the stock gap .35 and not .40 and it still is misfiring in all cylinders just like you but not when im at wot.

im having a similar problem on my cobalt but i think i am misfireing cuz i didnt change the gap the plugs came with when i installed the new ones do all plugs come with a 0.40 gap?