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idle issue

frankrizzo

NAXJA Forum User
Location
illinois
ok so my 99 4.0 had a rough idle that i could feel every 3 or 4 seconds. i changed the cap and rotor, spark plugs (champion coppers at .035) and plug wires. i also added some fuel system cleaning additive in the tank. i fire it up and its still there. motor mounts look good and like i said you could feel the shake every 3 or 4 seconds. kinda like a misfire. no codes and no check engine light. what should i look at next? fuel injectors maybe? btw it feels fine while driving. its only in idle and it doesnt matter if im in park or gear
 
The Jeep in-line 6 cylinder engine has never been known for its smooth idle. If it doesn't stall, there is no problem. You could test the ignition coil if you felt like it.
 
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