IAC (idle air control) can not maintain idle target speed
SOURCE: firing order for 1997 jeep cherokee straight 6 cyl.
153624 On cap #1 is two towers clockwise from right side hold-down screw, #1 is front cyl on engine. Firing order is clockwise.
SOURCE: 1995 Jeep Cherokee Country straight 6 cyl 4.0L: I
First of all, the fuel pump is generally located in the fuel tank, not always though. Yours probably is, in did not research it. The fuel electric fuel pump turns on only when the ignition key switch is turned to the start position and then left on. A series of one or two relays along with a pressure monitor in the fuel rail delivery system may or not cycle it on and off depending on design. Enough of that. I suggest that you remove the spark plugs to see if they are oil/heavy cabon deposits.If so, professional attention is reguired. One more thing you could try is replacing the spark plug wires. the may be old/worn out/damage. This would give the engine spark a stronger spark,if worn and also replace the spark plugs.
SOURCE: 2001 Jeep Cherokee with 6 cylinder engine -- PO306 code cylinder
Plug, plug wire, plugged or open fuel injector. are the most likely.
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Ever since fuel filling station overfilled the fuel tank , the vehicle won't idle when warm , start up is fine , just as soon as the engine has warmed up then it will cut out & won't idle when in Park , Neutral Drive whatever gear . I have just receintly replaced the Crank Damper Pulley as well .
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