I read about Seafoam fuel system cleaner on another site. My 82 Aspencade had an off idle bog, as long as I held the throttle in this position the engine stutter. This is also the same positon I hold the throttle at 50 mph cruise. Idle was bad until fully warmed up, at which point it would idle but not happily. I clipped the tabs off ot the pilot screw limiter tabs and turned them a full turn out. This helped the idle tremendously, especially when cold, however, still had the stuttering. Put a full 16 oz. of Seafoam in tank, filled tank with fuel. Road 157 miles to Milford, Delaware and back. She's cured! Found out that reserve does not work, I can see rust in the tank and I suspect the screen in the tank for reserve is clogged with rust. Not sure what I'll do about that.