Need advice on rough idle and missfire
11-04-2018, 06:09 PM
#1
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Join Date: Nov 2018
Location: Aztec N,M
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Model: Cherokee (XJ)
Engine: 4.0 l
Need advice on rough idle and missfire
So would anyone know why my 87 Cherokee would idle so rough and miss while it's cold once it warms up its fine but I cant seem to find out what it is I've replaced the distributor the rotor the spark plug wires and spark plugs and I just put a new iac valve in it including new fuel pump and alternator its driving me almost crazy at this point. The engine has less than 190,000 miles on it
11-05-2018, 02:44 PM
#2
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Join Date: Aug 2011
Location: Nor-Cal Coast
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Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Welcome Dakota. The link in my signature has a link to cruiser54.com. For an 87 you might start with tips 1-5. IMPORTANT! on the engine side of the throttle body there is a small black tube that comes out and goes back to the MAP sensor on the firewall. Crucial little tube that. Any crack or blockage and your Jeep will run like doogy.
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