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It sounds like the ENGINE MANAGEMENT has a problem which is a computer which controls the engine timing and particulary the idle(tick over)speed. What you have to do is take it to a garage for diagnostics.

HAVE THEM CHECK THE CRANK POSITION SENSOR

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โˆ™ 2010-03-20 03:40:49
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Q: Why does service light come on and rpm's of engine fluctuate wildly and sometime stalls. erg valve replaced when purchasedaround 20000 miles ago.can it be cleaned or disconnected have northstar eng?
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