I was wondering if maybe I could get a little help. New to Nitro and breaking in my engine. I fired it up and the idle was crazy fast. Clutch was engaged and the truck was moving forward. I adjusted the needles 4 1/2 high, 3 1/2 low but the idle stop screw in the manual said "1 mm" from the body. From the factory it was at about 1/4 inch. I screwed it TIGHT and it came about 1/8th from the body. Still the same idle speed. Is it busted or what? Any advice is appreciated.