I recently bought my first ZJ. Got a great deal and spent a whole weekend fixing it. runs great now except for a high idle in neutral or park. It drops down to normal in drive. But in neutral it is like a 1.2k RPMs.
Idle control valve. Clean as a whistle. looks new. cleaned it anyway.
Throttle control valve. was clean already also. no change.
I have been looking for a vacuum leak but cannot find one. All the hoses look great and plugged into the right spots.
I noticed that the engine runs a little cold. But not too much. Gage goes half way to middle. whatever temp that is. I figured a lower thermostat was put in. But if this is the case. could the engine be choking and trying to warm the engine up but cant because of a lower thermostat?
any help would be great!!