Run fault codes and look for temperature related sensors.
SOURCE: High idle in cold weather
this is normal for a car of this age
carburetor type motors have a automatic choke
this is activating when you start your car as it is so cold
i would not worries about it
it is designed to make it easier to start your car when it is cold my car dose the same thing
hope this helps
ricko
SOURCE: 02 Grand Cherokee High RPM start. Cuts out when driving
Ckean throttle plate inside throttle body...They tend to get dirtier than their counterparts in carbureted engines due to lack of fuel spray that kept them clean. If no luck with that, clean idle air control valve on TB. When doing this, don't turn the plunger, just clean with carb spray and replace. do not loose "o" ring seal.
Good luck
SOURCE: I have a rough idle at low rpm almost feels like
It could also be a vacumme leak. A quick way to check for that is to starting fluid around hoses and gasket areas. If the engine picks up speed when you spray around the engine and not directly in the throttle body, you have found your leak. I also believe these cars have an idol air control valve or IAC that might need to be cleaned or replaced. Check your spark/coil wires while you are checking around.
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