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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
You can pull the valve off and try cleaning it with a good quality carb cleaner. Look closley to make sure there isn't any bad carbon build up or pieces lodged in the valve seat. If a quick clean doesn't fix it (or its got a ton of carbon build up) replacement is your only option.