I have a 1995 Chevy Silverado c 1500 idle air control valve need wiring diagram.

Hello, your idle air control valve is not likely to cause a lean running condition. For wiring diagrams, you will need to obtain shop manual information, and can do so via multiple sources, including www.alldatadiy.com. I would recommend a professional diagnostic test with someone well experienced with OBD I vehicles, especially General Motors.

Can’t determine which year model the truck is - there are conflicting years posted. IF 1995 - the throttle body to manifold gaskets are prone to splitting and allowing air to be drawn into the intake directly - Alonso know as a VACUUM LEAK.