Jeep Won't Idle!!!!!

[tuekwik]

Finally got my engine running on my 2001 Jeep Grand Cherokee V8 4X4, but it will not idle right, very rough idle. But if I press down on the accelerator to about 2500 rpm the engine runs smooth. I replaced the spark plugs and the old plugs were black, running way rich. Any ideas???? Stumped

 

[manicmechanic]

Sound like air getting in thats not going past the throttle blades. Hoses, intake gasket, throttle body base gasket, are primary checks. Best of luck.

 

[green787]

Finally got my engine running on my 2001 Jeep Grand Cherokee V8 4X4, but it will not idle right, very rough idle. But if I press down on the accelerator to about 2500 rpm the engine runs smooth. I replaced the spark plugs and the old plugs were black, running way rich. Any ideas???? Stumped

Bad temperature senders and circuits can cause it to think it's cold causing the mixture to be rich...