have a 2000 4.0 that has a rough croppy idle almost like a miss after start up...now it goes away after a drive. things that are new and changed -plugs autolite plats -wiring autolite pro series -ignition coil -fuel filter -it has had a seafoam treatment -motor has been pressure tested and no issues so now im out of ideas...help!
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spray some carb cleaner around the vacuum lines and intake manifold. if the idle changes when you squirt an area thats where the leak is
have you cleaned the idle air control valve recently? how much oil do you lose between changes? do you lose any coolant?