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Old 11-29-2009, 12:22 PM   #11 (permalink)
 
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We were in colorado last summer and encountered this problem with a rough idle. We changed the air filter, and plugs with a wider gap [the iridiums were not available yet]. It helped a little but it was not gone. The real frightening thing was when parked at a stop light on a hill it would almost die on takeoff due to rough idling and then suddenly smoke the tires. It turns out that the clock spring needed replacing. This item acts as a tilt sensor. When we replaced it, the car became almost easy to drive, again the slight misfire is still there, although it occurs mostly when the motor is cold. The dealer was Advantage Chrysler in Farmington New Mexico. They persisted until they found the problem. Hats off to them!

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Old 11-29-2009, 07:14 PM   #12 (permalink)
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Mine does it occasionally, usually hovers at 900RPM but if i sit in a parking lot or something, it will drop to about 800 RPM, then rev up to about 1100 then drop down to 900 again. It changes when the high speed fan kicks on and off. Other than that nothing about a rough idle. Stock plugs, maybe I shoud get some iridums for a small project...
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Old 11-30-2009, 01:02 AM   #13 (permalink)
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mine will hunt for an idle at temps less then 65 with the a/c off. usually means there is a vacuum leak. I just put on a needswings intake and moved things around a bit.. i wouldn't be surprised if there wasn't one.

 
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Old 11-30-2009, 01:22 PM   #14 (permalink)
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My car will do that as well,usually after on a road trip at higher than usual speeds on the interstate when I am at idle at the first stoplight or so...Usually smooths back out...Figure that it must be the computer adjusting itself...Did this stock and still does it with MS1 and colder iridium plugs (gapped .033)

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Old 12-01-2009, 05:50 AM   #15 (permalink)
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mine spudders every now and thenm nothing MOPAR..
kinda comes with the steriod injected versions i've noticed

 
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Old 12-02-2009, 06:14 AM   #16 (permalink)
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i have also been experiencing the rough idle for a few months now and i was hoping someone here had it figured out.

i took my car into a dealership over turkey day weekend and reported problems with rough idling, decrease in gas mileage, and loss of "zip" or "oomph" when i step on accel pedal - basically i said it doesnt feel like the car is running as well as it was 6 months ago.

they found nothing wrong after test driving it.

the explanation i was given was the changeover from summer to winter gas (i am in chicago) that will cause rougher idles, decrease in mpg, decrease in performance... i said that sucks....

also, i paid for my first tune up 2 months ago at 25,000 miles and they replaced the spark plugs and air filter.

 
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