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usually the rough idling/running that clears when it comes on boost is caused by one of two things, firstly the AFM (Air Flow Metre) could be sits directly behind the Airfilter/Airbox and connects to the Turbo inlet pipe. or The Lambda sensor is faulty

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โˆ™ 2006-02-06 16:12:55
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Q: Why does your 1997 Fiat Punto GT Turbo have erratic idling and poor performance until the turbo kicks in?
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