Topic seems to be getting off track. To the OP...
Might be time for a carb clean/rebuild.
Our truck is not used much - only about 500 miles per year. The bowl is often empty due to evaporation. So, I expect to have to clean the carb every couple of years. Getting ready for Spring, I just disassembled the carb this afternoon and the parts are now sitting in solvent. Engine was running lean last time I ran it.
Rough idle and idle mixture screw not doing anything when you turn it is a clue that carb needs cleaning. (Plugged up passages as Jerry suggested)
Last edited by Gord&Fran; 02/16/2022 11:55 PM.