1998 Jeep Cherokee cranks but wont start when its cold

Sounds to me like a bad coolant temperature senosr. Replacing it should fix teh problem.

Have a 98 cherokee that cranks but does not start

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it

Could be the CTS not telling the computer to enrich the A/F mix during initial start up.