Where is the idle screw on a 1985 Chev C10 305 4 bbl?

The 1985 Chevy C10 with a 305 4bbl engine doesn't have a single, easily accessible "idle screw" in the same way some older carburetors did. Fuel/air mixture and idle speed are controlled by the throttle body's computer-controlled components. There's no readily adjustable screw to simply twist for idle speed adjustment.

While there might be a few screws that *influence* idle, messing with them without understanding the fuel injection system is strongly discouraged. Incorrect adjustment can cause serious drivability issues or even damage the engine.

If you're having idle problems, the best course of action is:

* Check the basics: Ensure the battery is fully charged, the air filter is clean, and there are no vacuum leaks.

* Consult a repair manual: A Haynes or Chilton manual for your specific year and engine will provide detailed information on troubleshooting idle issues and any relevant adjustments, if any are accessible without specialized tools.

* Professional diagnosis: The most reliable solution is to take it to a qualified mechanic familiar with fuel-injected systems. They have the tools and knowledge to diagnose the problem accurately and make the necessary repairs. Blindly adjusting screws is unlikely to solve the problem and could make things worse.