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Hi All, I'm having an issue with my 2001 6.8L 2WD. I have a random rough idle or miss but only when it's idling in drive. In neutral or park it goes away. Doesn't miss while driving or slowing down. Plugs and boots only have about 7K miles on them. No codes showing.
compression test time, followed by checking injector flow, could be a worn valve guide letting the valve rock at idle off the seat or a sticking shut injector