1987 F150 302. No trouble codes but engine idles bit too fast. Don't hear any vacuum leaks. How to slow engine down? ****** timing? Thanks
The IAC (idle air control) may be stuck from dirt or malfunctioning.It's located in the intake near the throttle body.Remove it clean with carb cleaner and reinstall
Testimonial: "Thank you for response. Actually had IAC off and was clean inside. Resistance within range 9 ohms but voltage signal at 12.5 V rather than 10.5 V"
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