•Remove the air filter and spray the exterior carburetor linkage.
•To eliminate gum and varnish from the throttle plate, spray short bursts into the carburetor bowl while the engine is idling.
•For automatic chokes, manually open and close while spraying the choke valve shaft. If sticking persists, remove the choke cover, start the engine, and spray the vacuum cylinder while idling.
•For PCV valves, disconnect the crankcase side of the valve and spray short bursts into the exposed end when the engine is cold. Allow it to penetrate, then start the engine and spray again into the exposed end. Wait a minute before turning off the engine.
•For manifold heat controls, spray the exposed ends of the heater valve when the engine is cold. Allow penetration, then move the counterweight back and forth until the valve frees up.