V8 started running rough after I put 17.6 gallons of 87 octane in it by accident (was talking to a buddy and not paying attention). Acted like a misfire and lacked power. CEL was lit. Pulled the codes and it listed a P0358, but no cylinder showed a misfire. The car has the factory extended warranty on the valve cover and the coils. Could it be bad gas causing the issue and it will cease once I run that fuel through? Vehicle has 73K on it and has run like a champ until I put the lower octane in. Coincidence or not? If it is the coil, which cylinder is the "H" Primary?
Thanks,
ethosb
Thanks,
ethosb