High idle on a 1993 GMC Sonoma 4.3L V6

Hello, is it high idle at cold start or only when warmed up? This could help troubleshooting. If it's always high, there has to be some kind of air intake leak. A cold engine does not rely on all those sensors you replaced -- those only come into play after the engine gets to normal operating temperature and acts to operate more efficiently. Unmetered air getting into the engine without desire will always raise the idle -- unless you do not have enough fuel, in which case it will stall. I appreciate you've made some efforts, but without a lot more information, anyone trying to answer is flying blind. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.