I have a 2003 Liberty 3.7L. When the engine is warm and it is cold outside, the engine drops RPMs and dies. No codes are coming on and the jeep will restart but won't idle correctly. Any ideas?
Thanks
Jeff

If it didn't have a computer and plugs, air , and fuel filters were good, I'd be looking at vacuum first. Only when it's cold out?

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If it xly's, xucks, or xloats rent it.
1978 CJ5 304,T18,DANA20,MSD,EDELBROCK X3,MALLORY,D44,DETROIT LOCKER,LONG WAY TO GO
2006 LIBERTY Sport, Franky II PREM, moab's, 245/75/16 KM2's, All JL audio system, LIMO TINT.

Check the plugs first. When mine were worn thy caused rough idle at start-up sometimes and a miss every so often when driving at highway speeds.

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'02 Sport 4x4, 3.7L, 245/70R16 Bigfoot A/T tires, Tow Hooks, Rear Hitch

Remove, the air intake from the throttle body and clean the black carbon and gunk from the throttle body bore, TRUST ME !!!

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96 XJ with a lot of crap !!
04 KJ with some crap!!
15 Forester XT
14 STI Wagon
75 Cutlass "S"

try what he said ^^

could be a gunked up IAC, usually if the IAC itself is bad, it'll throw a code or the idle will never drop .. then it'll throw a code

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03 Renegade (Black)
177k miles 3.7L gas - 45RFE
Command Trac / 4.10s
Lift: ft. 790+ rr. JBA4+
The last of the TrailReady Front&Rear Bumpers and TR Rock Rails
Jarhead Offroad light covers
31x10.5R15 RedLetter Grabbers on Blackrock Dunes
L.O.S.T #KD098632

Will give it a try.
Thanks