My idle screw keeps going out of adjustment and I finally figured it out. I can go for a 30 min drive without any trouble, but as soon as I got on it hard after driving at a steady speed the car would no longer idle high enough. Well tonight, it happened again and I marked the idle screw last time I adjusted it, because I had a feeling there was a problem, and sure enough it's backing out. The problem is the bottom of the idle adjuster screw has a high spot, so when I turn it 180º I can see the throttle go up, down and back up again. Will this screw back all the way out so I can grind it flat or will I need to do it while on the carb?