If the throttle plates are closed, a vacuum leak would be the prime suspect.
it's in the high pressure side of the ac line
YOU WILL DIE! have you check your IAC ??
Paul G. Blazer High School was created in 1963.
Odds are you need a fan switch, It is very common for the high on GM fan switches to go out.
nox is from exhaust temps too high or a cat. convertor breakdown.
Kevins
how to change upper tie rod on 96 chevy blazer
ford suck. go Chevy
A sticking choke or vacuum leak are two common causes.
possibly the multifunction switch is acting up or just bad
1995 blazer350 v-8 wont start unless i use starting fluid,once on it idles high
Perhaps a stuck throttle plate - try to free with a screw driver The throttle position sensor is also notorious for causing this as well. A vacuum leak can also cause high idle speed, but the vehicle will generally run rough as well.