Thread: '99 Vortec 350, Code P1509 (High Idle)
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Old 03-25-2014, 09:31 AM
maxwedge maxwedge is offline
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Re: '99 Vortec 350, Code P1509 (High Idle)
Right about the vacuum readings that is how the pcm calculates it. Possible the iac itself is bad or carboned up.
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