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The 6 cyl engine uses a coil strip for all 6 cylinders, and the 8 cyl uses one coil per cylinder. So I assume you have an 8 cyl engine. You are saying one coil has power but is not firing ? Have you switched it with another cylinder to eliminate the coil as a possible problem ?
So that you get a little confidence in what you are going to attempt, please go to your auto supply store and get a copy of the Haynes '99 Jeep Cherokee service manual. It has everything in it to help you. Don't panic...take it slow!
Does it have an aftermarket fan switch? usually it is located beside the radiator. I had one of these in my 86 trans am, all you have to do is adjust it until it shuts off. hope this helps
over pressure or high pressure in system will cause high pressure cutoff switch to go open,also poor air flow across condenser could add to the problem. When the A\C stops getting cold is the compressor still engaged and running.
remove the cluster clean contacts with dielectric spray then apply dielectric grease to connectors and reinstall if this doesnt help you need a cluster
Running out of power going up a hill is generally the fuel pump. Now days a plugged catalytic converter will do it also. The fuel evaporation test could be a bad gas cap or evaporation canister or hose somewhere. The exhaust manifold is a jeep thing, expansion and contraction, hot cold over and over. Have it welded or replaced.
Seems to be a chronic problem with crank position sensors... On yours it is tested between b&c terminals and should have no continuity there. (should show an open circuit if good)
EGR VALVE is carbon up you can clean it by taking it off and using carbon cleaner also replace the sensor for the egr valve. EGR controls idle if carbon up it will cause this problem you explained.
check fuel filter or possibly plugged up catalytic converter
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