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Anonymous Posted on Jan 10, 2010

I have a 91 xj auto trans and 4.0...it sometimes ides down to about 250rpm then back upto 1100 or so then back down and so on...but if i touch the gas in park it stops this idle issue and most of the time levels out..the same issue is related to another issue..when in drive sometimes it will (WHEN GIVING IT GAS)fall on its face then if i let off the gas it will go just fine ..until i press on the peadel again...so i have to ease into the trottle..also it is getting bad gas milage ( about 12.5 to 14.3mpg) and is sometimes hard to start...keep in mind all of this was a sudden change..it just started all of these behaviors one day...i have replaced the feul pump and sock and filter as well as the pressure regulator..all plugs and wires .cap and rotor

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  • Posted on Jan 10, 2010
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Try idle air control valve

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