Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hi ther and welcome to JA
If its for sure its a carb-at the drivers side pop the cap off the A/F mixture screw- turn A/F mix screw till it seats back it out 2 turns set idle screw curb adjustment at 650rpm-now start closing the mixture screw till you feel its misfiring then back it out qtr turn, then readjust curb idle to 650rpm. Might want to inspect the choke system -choke plate could be binding not opening fully creating the rich mixture.