ABOUT 1,000
Adjust the idle screw.
idle speed for a 99 Tahoe
all depends if it's carburated or fuel injected.
The idle mixture screw is located at the base of the carb in the rear underneath a bracket. Very difficult to do as a small tin plug must be removed first. The ile speed is on the drivers rear of the carb
check engine temperature sensor There cheap and if yours is weak or bad Computer tells engine wrong signal
40 on idle
between 500/750 depends on where the idle screw is set
it should be were the cable lincage is on your carberator
19 to 21 inches at an idle.
Idle control sensor on the driver side strut tower. The cover should be blue.
It could be a number of things, depending on if it's fuel injected or carburated. The easy fix would be a plugged fuel filter. If it has a carburator, it could be a stuck choke or a vacuum leak.
it may need to be adjusten on the fuel/air or the float s if carburated need to be adjusted