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2000 Durango 4.7, Idles at 1500RPM then next tine idles at 650RPM may go for a day or two then idle OK. Idle does drop to normal after shifting to D or R. seems to be weather related (rain)


Also on heavy rain driving tach will jump 300 to 400 RPM while maintaining same highway speed. Took to dealer for a spin on readout computer nothing showed up. Went to independent garage for computer hook up they also found nothing.
 

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Sounds like the Throttle Position Sensor. I'd change it. I don't recall if the 4.7 uses the same one or it's a similar problem. It is fairly common on the TPS on the 5.2/5.9 for it to have issues. I had it also. The TPS will cause the the engine rpm to momentary blip up a few hundred rpm every now and again.
 

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if not what Neil said than when was the last time you change your spark plugs. I remember another member said when one plug is not working correctly you have goofy rpms
 

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I've had consistent erratic idle issues on my '02 as well. I have replaced the plugs, TPS, IAC and none of them made a difference.
 

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The clock spring under the airbag of the steering wheel can cause several problems including throwing a P0123 code, which is a high voltage on the throttle petel sensor. If you cleaned/replaced the TPS and still have problems I would suggest replacing the clock spring. The chysler code checker will show a body code for this issue. Take care with air bag protocols.
 

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I'd check and clean the IAC also, takes all of 5 min to remove, clean, replace.
 
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