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Every once in a while, while idling, the engine will drop to about 500 rpm's, seem to almost stall, then pick up again. It never stalls, and this symptom only last for a few seconds. I have tried changing the plugs (it needed it, anyway), and have added fuel system cleaner (Seafoam), but to no avail. This is a hit and miss situation, and it never sets a CEL. I have had it to a dealer, but it doesn't happen then, so they tell me they can't help unless the issue duplicates itself.

This a 4.7L HO, 4X4 Quad Cab, with 35,000 miles.

Any help will be greatly appreciated!

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