Ok. My '85 GP lately has been getting stuck on fast idle and it's a pain trying to get it off. I still have stock engine in her. No other problems at all with it just it gets stuck and fast idle and when I go to shut her off she sputters and won't let me shut her off. It doesn't do it all the time just on some occasions. How I have to get it off is tap the gas and hope it jumps back down out of fast idle. Any thoughts?