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1994 Grand Cherokee Rough Idle under load

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Old 07-19-2010, 07:06 AM
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Year: 1994
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Engine: 4.0
Default 1994 Grand Cherokee Rough Idle under load
Hi New to the Fourms!

I have a 1994 Grand Cherokee 2wd ( I know changing it to 4wd drive soon).

The Engine is a 4.0L and under a load, AC on or when in drive or park the engine seems to bog/Vibrate. You can feel it through out the Jeep. Any Ideas what it could be?

I have tuned it up. Cleaned the throttle body.

Thanks fo any help i can get.
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Old 07-19-2010, 06:37 PM
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How many RPM's is the car sitting at on idle ? Could be missfires or inproper gap on the sparkplugs.
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Old 07-20-2010, 10:12 PM
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does your idle needle go up and down when your at idle in park
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Old 07-20-2010, 10:18 PM
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The IAC motor may not be functioning and causing the idle to be too low under load
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