Last night I was able to find some time to do some testing and maintenance. Ran the BG EPR and BG 44K products through it as directed and then changed my oil and filter. I was going to do the Mopar combustion chamber cleaner as well but didn't have anyone to keep the idle up for me while I sprayed in it. Took it for a drive and it ran ok.
Today the P0302 code came back. Just out of curiosity I pulled the plug and it was oily (Changed them in January about 4,000 miles ago when I changed the coil, plug, wires, and O2 sensors) The gap also opened up slightly as well. I put a new plug in and gapped it correctly. Still running extremely rough at idle and when trying to go above 40mph this thing rattles like hell. I had a friend around today so I figured I would try the MCCC today as well. After driving the vehicle around for a bit to get it up to temp I attempted to spray the can in while maintaining 1000-1200 rpm I couldn't even get the throttle plate open at this rpm range. At 2000 rpm the plate barely opened up enough to squeeze a quarter in. Is this normal? It is the first drive-by-wire vehicle I have owned but I know not to force it open so I didn't.
Any ideas how far the OEM 3.8L throttle opens up at specific ranges?
Could I possibly not be getting enough air in?
Could this cause a misfire code?
So many questions. I have attached a few pics of the original plugs I pulled a few months ago as well as the numbers from the cylinder compression test. I did notice the #2 plug was actually pretty dirty back then too. Didn't think much of it at the time.