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my xj keeps miss firing

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Old 12-29-2009, 11:31 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
Default xj is runing bad when under a load

I have a 1990 cherokee with a 4.0, when i start it up it runs fine and i can rev it up and it runs fine. But when its in gear and I'm getting it up to speed it starts to miss. Once I get it up to speed it stops missing and runs ok. I tried new plug wires and a new cap and rotor but it still keeps missing. i don't know what to try next. Any help would be appreciated.

Last edited by sarkozi; 12-30-2009 at 02:12 PM.
Old 12-29-2009, 11:52 PM
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Year: 1990
Model: Cherokee
Engine: 4.0
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check your compression, sound like lw compression on 1 cylinder
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