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Old 03-06-2013, 08:02 AM
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detcordram detcordram is offline
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Join Date: Mar 2012
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Vehicle: 1999 Dodge Ram
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Engine: 1998-2001 360ci (5.9L) Magnum V8 245hp(standard), 250hp(Sport package)
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Default Idle Air control Valve or throttle position sensor

So when I start the engine it revs up and down between 1100-1400 for about 20 secs and then drops to about 800-900 for around 45 secs then repeats, It does the same thing if I try idling down the street, Im just trying to stay under the neighborhood speed limit and the neighbors are looking at me like Im trying to show off by revving my engine. From what I've tried looking up myself I think it could be the Idle Air control Valve or throttle position sensor, Both seem to be easy enough to try replacing myself and only $30-$40 at the local autozone, another symptom is if Im in park and have the air running for longer then a few minutes I start getting a hissing sound and the engine goes from a nice purr to almost nothing and then goes back to normal if I start driving. Any ideas of where to start or if its a completely different problem?
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