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Error Code P1509


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I have a 1999 GMC Yukon that has started showing the Service Engine Soon light when under load. Usually when climbing a steep hard grade. The vehicle is equiped with some type of cat back system(I bought it used) and has a K&N Filter in it. Once I let it set for a while and do some lite driving, the light goes out.

My code reader shows an error code of P1509, IAC System High RPM. Any ideas as to what may be the problem?

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