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Gordon, atthehelm,
My friend has a '99 Durango, 5.9L, with the exact same problem you describe. He has changed the plugs and wires and cap, and the problem is still there. We even checked the new plug in #8 and it's VERY clean -- looks just like #4.
Drove it cold last night, and holy cow it ran strong! Thought the cap and wires fixed the problem, until the problem reappeared a few minutes later, after some warm-up. So the behavior helps me rule out two things which the dealer suggested: It's not the "bed pan" (intake) gasket, since the effect of a vacuum leak would be minimized at WOT with fuel injection (and that's where the problem occurs worst), and it's not a plugged catalytic converter, since it ran so strong when cold.
So, what did you learn on yours?
Thanks!!
Jeff
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