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I'll Seafoam it and see if it helps. I assume a vacuum leak wouldn't only affect one bank, right? Didn't do the knocks. Pulled and looked fine, maybe I should have changed them just to eliminate that possibility.

Can a cat go bad without throwing a cat efficiency code? PO420, I think it is. I haven't had that code.

I'll drop the exhaust from the manifold and see if it runs any different and post up the results. Thanks for the input.

I took it to the Chevy dealership and their recommendations were changing 02 sensors and to do their 4 stage fuel system flush at a cost of $325. I got it back from them and changed the 02's and nothing. I've run injector cleaner through the fuel tank twice with high octane fuel in the last...

I have a rough idle and codes PO300, PO151 and PO155. The truck runs great other than at idle. It bounces between 500-700 in park and at stop lights, but runs fine once moving. Things I've done so far: It threw PO171 and PO174, so I changed intake gaskets. Codes gone. Changed plugs, wires...

Any luck after replacing the PCV valve?