If you know the spark plugs and wires are good, then check for a vacuum leak. The vehicle is 11 years old, and you may very well have a crack in a vacuum hose. A leaking intake manifold gasket will also cause rough idle.
Check the motor mounts.
Sounds like you have abad vacuum leak,Or a bad idle control motor. Check vac leaks first.
vacuum leak?
Sorry, nonadjustable. Computer handles that.
vacuum leak
650-800
Well...the misfire on 1 and 3 would explain the rough idle. The misfire could be from worn plugs, wires, bad coil, or bad injectors.
yes they are in a 1994 chevy silverado and is located on the left side of the throttle body.
Is anyone on line to help me with this question? Where is the fast idle thermal valve in a 1997 Chevy astro van located?
You broke it. Way to go.
Check for a vacuum leak
While the truck is running in idle pull out the dip stick and read it.