I lucked into finding your Youtube channel. Great stuff! Now, can you possibly give me some insight into a problem I am having with my 2003 GMC Envoy 4.2ltr? The check engine light came on so, I ran a code check and found P0300 "multiple misfires". I pulled the coil packs and found oil in plug wells 1, 3, 5, and 6. I picked up new coil packs, plugs, and gasket sets, pulled the old beast apart cleaned it up installed new gaskets, plugs, and coil packs. Got it reassembled and now I still have the same problem. Same code, same misfire. For the life of me, I can not figure this out. Any suggestions on what to check next? P0300 is the only code I get.