My 6.5 had a single ( 1 ) miss one night and the next morning I went to start it up it started to surge from 800 rpm to 1800 rpm , up and down , up and down . I shut it off and restarted it and it was fine . Is this a warning of something to come ??? This is the greatest forum that I've ever been a menber of , you guys sound like you really want to help . Please keep it going.