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2001 Ex. Rough Idle / Miss Only At Idle In Drive

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Old Feb 16, 2026 | 03:47 PM
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2001 Ex. Rough Idle / Miss Only At Idle In Drive

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.

Thanks
 
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Old Feb 23, 2026 | 11:22 PM
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Less load and/or more revs will often hide a misfire.

Can you scan it to see if any misfire counters are accumulating? . . . and if there are codes stored?
 
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Old Feb 26, 2026 | 10:56 PM
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No codes at at all using multiple scanners and OBD Fusion with the enhanced Ford add on.
 
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Old Mar 2, 2026 | 04:11 AM
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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
 
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