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Well in answer to somebodys question, I did say there was almost no carbon, it was very clean. I have also never had it near 5400 rpms. I got it all back together and it was running, but I had a miss, I suspected a plug or wire, it was only missing from idle to about 2500. So today I pulled all the plugs, checked for cracks in the porcelain, re-gapped them, a couple were a bit out of whack. Went to start it up, and it sounded just like it did the other day when all of this started. Which takes me back to this isnt a freak occurrence, something caused all of this, but what? I have the Valve on #4 stuck open this time, which means its probably bent, which makes me think maybe the timing chain is out of whack? The marks on the gears lined up perfectly, but could the tensioner be making up the slack and keep it in time, so to speak? I dont know, but what I do know is I am back to square one. what a piece. I know a lot of people love the 4.2, but I have been less than impressed since day one.
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