Idle problem on cold start
I have a 98 ZJ 4.0 inline 6. This morning, on a cold start it would not idle by itself unless I kept my foot on the gas. This happened once before, about two weeks ago, but between then and now it's been fine. I'm not certain, but I think the problem went away if I kept my foot on the gas, then moved the transmission to "D" - it's almost as if the engine wont idle in "P" or "N" by itself. This might have just been coincidence as the car may have warmed up or something.
Any ideas ?