Re: 1984 8 hp evinrude
Those carbs are very prone to clogging of the high-speed orifice that's located above the plug in the float bow. That will produce the symptom you're describing. It could be something more complicated than that, but that's a common occurrence with the 6 and 8 hp engines.
You can, very carefully, clean that orifice with a copper wire smaller than the orifice. That will often take care of the problem.