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Can a lower intake manifold gasket leak cause this code ? We performed the wiggle test to the harness connector .no fault detected.
Thanks
John

Vehicle: 2003 GMC Sierra 1500 4.8 ltr

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It's very unlikely that a manifold gasket will cause this problem. You could try cleaning the throttle actuator plate first, but you probably have to replaced the Throttle Actuator to fix the problem.

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