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1992 Lexus SC400 Question: why is the engine idling very high?

 

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que2, 4.0L V8, Mobile, AL, May 19, 2012, 21:50
 Rookie

my rpm needle goes from 2000 and drop to 1000 rpms up and down constancely and it travel about 45 mph w/out putting my foot on the gas.I have perchased a position throttle sensor and still have the same problem.

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