Chester,
I agree with Russ that replacement is in order. I'm not sure if these solenoids are failing for electrical reasons or physically getting stuck. I would try a couple of things that may buy you some time before replacement. I would blow out the exhaust port very well. I would cycle the switch a few times. Then I would support the valve & strike it sharply with a rubber hammer. If its failure is due to dirt it may dislodge it. For me it is worth a try.
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Steve
Newell
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