What engine management are you using? The one that came off the Sierra? If your coolant isn't touching the temp sender, or the temp sender has failed, its most likely running rich (choke) as its trying to warm the engine up. Is your a catalytic model?
Also if the idle control valve is sticking usually means it will rev up to 1250 ish and back down to 800 ish. Check for air leaks, The idle control may be fine, but your TPS might have been moved.
|