My '01 cherokee runs fine under normal driving conditions, but when I use it on my mail route it barely runs when I start it after it's hot. I have to rev the engine to get it to run right again. The MIL came on and it gave a multiple missfire code and some other individual cylinder missfire codes. I also noticed that when starting it this winter, somtimes when starting it when cold it acted like the firing order was wrong. I would appreciate any suggestions. Here's what I've done so far:
Changed the spark plugs, checked the coil rail with an ohm meter (checked out alright), put insulation over the injectors (for the known vapor lock issue), ran valve cleaner through it twice, changed the throttle position senser, cleaned the throttle body... again this only happens on the mail route, when it has reached operating temperature. Thanks ahead of time!
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03-22-2010, 09:54 PM
