I have a 04 Expedition 4.6. It idles fine when it's cold,but once it's up to operating temp it seems to idle rough, but inconsistently. It feels like an intermittent miss or something out of balance.
The car has new-plugs, coils, egr controller and egr valve, fuel filter.
I have cleaned- PCV valve, throttle plate, mass air sensor.
I had the car smoke tested for vacuum leaks it had none and had it run on the computer where it read perfect, all sensors were reporting, no misfires, no fuel issue. The mechanic was stumped.
Does anyone have any experience with a similar issue? Any further suggestions on what to check?
The car has new-plugs, coils, egr controller and egr valve, fuel filter.
I have cleaned- PCV valve, throttle plate, mass air sensor.
I had the car smoke tested for vacuum leaks it had none and had it run on the computer where it read perfect, all sensors were reporting, no misfires, no fuel issue. The mechanic was stumped.
Does anyone have any experience with a similar issue? Any further suggestions on what to check?
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