The REPAIR: Scan for codes P0300 - Missfire graph shows no. 1 cylinder missfire - Perform compression test no. 1 has 175 psi, and nos. 2-5 has 225 psi - Perform leak down test on no. 1 cyl. - 20% leak down on no. 1 cyl. at 100 psi leaking through intake intake valves.
Replace cyl. head, replace all valves, replace all valve springs, reinstall cyl. head, test drive.
The PARTs: One Head # 88984229, Ten Valves # 24576974, Ten Valves # 24576975, Ten springs # 12596078, Gasket # 88984219, and various bolts, seal, coolant, oil.
I have driven 1k plus miles since the repair, and took it off road to see if there would be any rough idle, hesitation, or stalling at these lower speeds and conditions, and NO PROBLEMS so far, so good, running very smooth. The problem and repair is pretty much the way f5fstop described it in these engine problem posts. BTW f5fstop, the dealer and I had a total miscommunication and everything is OK!, Cool.
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