Question about 1999 Chevrolet Silverado 1500

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My truck seams real sluggish and seams to lose a lot of power when the air is on plus it has a rough idle just wondering if there is any thing i could try to help , its a 1999 chevy silverado with 199000 miles on it and its kind of funny cause it just does it intermintently

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Idle Air control valve. these tend to go bad due to a lot of carbon build up on the pintle seat. This unit is attached to the throttle body behind the throttle plate. Your basically gonna wanna clean that throttle body body out with some throttle body cleaner, soft brush like an old tooth brush, and a rag or two.

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