Throttle slider? Do you mean lube. IF you mean a tube the throttle rod slides thru. sounds like it is binding some how. Maybe the tube is not large enough for rod. Will it slide easily when not hooked up.p? If so then your binding somehow. Far as lube. WD or grease. Soap maybe also. But should not need anything such as lube. is ther any corrosion around throttle barrell. Something with the carb not letting it move easily? Can you put a pic of it on here?