I had a similar problem with my Crown Vic .the wipers wouldn`t go on intermitent. I changed the motor and that was fine . as far as your problem goes I would recommend a changeout . it`s not that hard ,I mean if an all thumbs idiot like me can do it then surely an intelligent young buck with a little common sense can too . just note how it all comes apart and then go backwards . in other words its not difficult to do . ;-)