I have a 98 TJ 4.0, 5 speed. Is idle problems common on jeeps in cold wet weather? It's only first thing in the morning. Once the engine is at operating temp it runs fine. Otherwise, may or may not idle at initial start up and stalls at intersections, until engine is warm. Gets great fuel mileage (16 mpg on 33's) and seems to be running clean. It runs strong but has small fluctuation in idle even at opperqting temp; not enough to notice on tach.Recent repairs are plugs, cap, and rotor.