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It's not the plugs because this also happened prior to replacing them. That also rules out water in the gas. Yes, I gapped the plugs correctly.

That's an affirmative on the exhaust fumes. Haven't checked the temp of the cats though. Plugs and coils changed recently. Yes, I put in the correct NGKs. And I'll add that now I'm also getting a P0300 code (Random or Multiple Cylinder Misfire Detected) and it's stuttering something fierce at...

She's nearing 100K. I stopped in at my mechanic yesterday and the first thing he mentioned was the cats as well. That might also explain the exhaust smell. Any suggestions as to which brand makes a decent cat that doesn't require a 2nd mortgage?

SO I have a 2008 Libby and recently it started popping the MIL. Scan tool would show the P0038 as well as the P0052 codes. I can clear the codes and when the vehicle is 'cold' I can get several miles before it comes back but if I try to clear it when it's up to temp it just comes back almost...