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btw, in park, idle sits at 500 RPMs and doesnt move. As sson as I put into gear (reverse, drive) it drops to 300-200 RPMs.

Replaced water pump, serpentine belt and A/C belt. Now the idle of my 2001 Tahoe sits around 500 RPMs and will stall at slow speeds, i.e., turning into a parking spot or at red light. None of these probelms happened prior to changing the items above. Tried to hook up a diagnostic meter but...