Joined: Nov 2016

Posts: 15

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I have an 06 ctsv, the car has been sitting for awhile, so the gas tank was pretty much on E, drive car about a mile to gas station and nothing felt bad at all misfire wise, was leaving the gas station and immediately the CEL started flashing, and it poped up as P0300 code random cylinder misfire. I replaced plugs and wires, filled up gas and now it only misfires under full throttle, and when the RPMs drop it’ll misfire but not die this time. And when the cel flashes it’ll flash a bit and than stay on. I looked at my tuner and at idle my throttle body is at 18% and at full throttle it is at 88%. Which seems like it’s in the range of normal, but I am all out of ideas on what to do, and I am getting normal fuel pressure at the fuel rail, 60psi at idle. Mods are long tubes/ high flow cats/ and full magnaflow exhaust.

Joined: Dec 2014

Posts: 648

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