i have a 91 f150 2wd automatic with a 5.0. It's bone stock and recently had the throttle body cleaned. It started up fine cold this morning but now it cuts out when I drop it into reverse. The rpms drop when it's in drive or reverse but they seem to be dropping too low now. Is there a way I can raise the rpms a little to prevent it from stalling?

 

The idle is controlled by the idle air bypass valve, attached to the side of the throttle body, and allows air to get around the throttle plate. Check to make sure that's working, like its connector is tight. When the engine is idling, pull the connector to see if the idle drops.