Fuel injectors generally respond very well to quality fuel additives, but you still need a “deep clean” occasionally. Use Berryman B-12 Chemtool Fuel Injector Cleaner (part #1112) in every third or fourth tank for cleaner injectors, and use Berryman B-12 Chemtool Total Fuel System Clean-Up (part #2616) about once a season for cleaner intake valves and combustion chambers.