The proper way to adjust it is to disconnect the cable and operate the linkage lever by hand, holding it against the idle stop. Then adjust the screw for your desired idle speed. Finally, re-attach the cable and check that it pulls the linkage up against the idle stop when you put it in neutral. If it doesn't, adjust the black nylon attaching Connect the GR8 to the 12V battery and set to ECM power supply mode. If the vehicle battery voltage drops below 12.0V or above 15.5V during reprogramming, the ECM may be damaged. Be sure to turn OFF all vehicle electrical loads. If a vehicle electrical load remains ON, the ECM may be damaged. Be sure to connect the AC Adapter. All of the vacuum lines look good and appear secure. Also the idle up seems to work when engine is cold. After engine warms up idle drops down and with A/C on it is almost stalling. So the A/C idle does not seem to be working. This 1992 22re seems to be different from the 1988 truck engine. Yes that's normal, your AC system works 50% better with the engine turning at 1000rpm than at 650rpm. You can adjust it back so there is no change in idle speed. But I think a faster idle is better. It turns the pump faster and if you have an engine driven fan it pulls more air through the AC radiator too. Vay Nhanh Fast Money.

how to adjust ac idle up