1989 S-10 Blazer 4.3 with High Idle
#1
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Hello All... I am having a problem with my Blazer. High Idle on start up and will not come down. I have changed the IAC and I know it is most commonly a vacuum issue, but I can't find a leak. Any ideas?
#2
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My first guess would be the throttle body base gasket. Use an unlit propane torch around the base of the TBI unit with the engine running. Listen for a change in the sound the engine is making.
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