just changed my headgasket but now its acting up really weird..upon trying to start it up it fired up and made a loud ping noise like somethings inside it tapping...then the idle just kept on climbing ...so i shut it off..what the hell could it be..now it takes a lil while to crank up and seems to idle really rough.....set up is a drag 3 kit..stock 95 ls block..and gsr head in a 95 gsr sedan...compression came out to be 1..180...2..185..3..175...4..165