Have fixed several wiper problems on chevy trucks in that year range .and in every caseproblem has been in the green circuit board of ththe wiper control . that is located under the hood on the fire wall just below the drivers side wiper . remove the screws off the cover plate and check for a broken solder joint on the grond wire . located where wire plugs in . most time you cant even see the bad solder joint ( called a cold joint ) but just resolder anyway . good luck
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