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still idles rough (like it has a bi cam in it) but not losing any MPG on the highway...still not sure what the issue is

THanks for all the replies...the plugs were replaced AFTER the misfire/rough running was noticed, so that cant be whats CAUSING the issue...but I see your ppints. The O2 sensors were replaced last summer. I did find some oil on one of the plugs so I suspect a leaking valve cover gasket.

Duralast New Mass Air Flow Sensor DL-3122 Bosch Iridium Spark Plug 9603 Denso Ignition Coil 673-6004 I also replaced the gas cap and the latest code thrown is P1132

I found my 01 LS V8 running rough the other day, took it to an auto parts store and had codes checked. Cam=e back #4 cylinder misfiring. Order a new coil, installed all 4 spark plugs, same condition. Took it to a shop who did $540 worth of work (diagnostics and 4 other plugs), and came back that...

pretty sure he replied somewhere else that he just cut out the fins from the OEM grille