Ok, so I have had a problem with my 94 Cherokee ever since i bought it, last February, when the temperature drops below 50 it wont start. It cranks but does not start. I get spark going to the ignition coil, but nothing coming out. When i turn the key I do not hear the fuel pump, but as soon as it hits 50 degrees I can hear it when i turn the key. I have changed the cps, plugs, plug wires, distributor, distributor cap, and the ignition coil, but still no luck. I dont know if anyone else has had this problem, I look through the threads but i didnt see anything that was affected by temperature like this.

 

When it's good and cold, try heating the ECU with a hair dryer or trouble light. If it works properly then, you found the problem. Look here:
https://www.cherokeeforum.com/f2/fue...old-but-64497/

 

When you checked codes what you get ?