when the engine is cold, the computer injects extra fuel much like a choke. when the engine warms up the computer can then run at the correct fuel mixture. if your coolant overflow bottle is full of ice, it could be that your ANTIFREEZE mixture is incorrect. i would suggest draining and filling with the correct mixture. < one thing i would check is the TPS(throttle position sensor). if that is incorrect or missing, it will cause the problems you are describing.
1989 cherokee 2dr w/2002 4.0, 1998 ax-15 w/ external slave, 3" lift 31x10.50x15 BFG A/T, ARB ZJ front bumper, WJ front brakes on 1994 XJ D30, WJ Steering, C8.25 w/3.55 and ZJ discs, Detours Tailbone, and a few other things here and there
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