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Describe this vacuum switch.----Does this " vacuum switch " have a red lever ?----If so , it is not a vacuum switch.----Overheating and going into S.L.O.W. mode ?--Water pump impeller looked at ?-----Sorry it is up to you to do some trouble shooting.-----Compression test , post your numbers.----Does spark jump a gap of 3/8" or more on all leads on a test device ?