2012 5.0 Supercharged 470hp
I'm stumped. No codes no CEL nothing. Idle is rough and around 1900rpm you can feel vibration from the engine. Replaced all engine and trans mounts. All plugs and one coil changed 12k miles ago currently at 50k miles. New filters oil and cleaned MAF/Throttle body. Ran couple of different injector/fuel cleaners. Ran the car at full throttle up to the 155mph limiter. Tried all different types of fuel.

Combined misfire information fuel cut-off execution flag Bank 1 is switching between true and false.
and also Combined misfire information number of catalyst damage judgments and firing cycle counter
Idle speed I think is pretty stable around 600 rpm.

The dealer said I should check for compression and clean the valves. Anything else to try before embarking on that journey?

 

Test O2 sensors is my opinion