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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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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