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yes, everything was good until the cat....now it's a ripple effect of one thing after another...

First, thank you for replying. I am not a "car guy" so will do my best to not embarrass myself in my answers. The cat was throwing codes for a few months. Was told it wasn't a big deal so just waited until inspection was due to fix it. he replaced the drivers side in October - pass side was...

I have a 2011 JGC Overland V6, 160k miles. Replaced Cat Conv in Sept, then noticed engine running rough. Eventually CEL came on. Mech said cylinder misfire 2, but the oil cooler was bad and needed to be replaced. Done. One week later, CEL came back and now read Cylinder misfire for 2-4-6...