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Thanks for the input. I'll do some more t/s'ing to see what I come up with. About 10k ago I did a complete tune-up with cap/rotor, plugs, wires and have run some injector cleaner through it a few times since. It runs perfectly and shows no other codes except the PO420. I have checked fuel pressure and it holds according to the book. I have not checked for any exhaust leaks but don't believe I have any according to what I can hear. I will check the vaccum readings next. Is it possible that the high flow converters are tripping the code and I need one of the O2 sims or that I just have a bad post O2 on the left bank?
The vehicle also has a flowmaster muffler and dual tails from the muffler but I was getting the PO420 code prior to and after the installation of the flowmaster.
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