Car is not running right. Rough idle and misfiring under acceleration.

Wilson2608

Okay I’ve checked a lot of things since last posting. Not fuel pump as i checked it with a gauge, it could be a injector I’ll double check that next. Negative cable is good, spark plugs were not bad either.

I’m really starting to think it’s my cats. They are Z1 Motorsport cats and I’ve had them for about 40k miles. The problem is so inconsistent it’s hard to diagnose. Today i hopped in and fully accelerated and i had like maybe half the power and the engine sounded really muffled almost like i had an exhaust leak but it was quiet( if that makes sense). Stopped the car went to class then came out an hour later, full throttled the car with no problems at all.

I’ll try to take a video next time it happens and upload it. Thanks for everyone’s input so far.

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Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.