Does anyone know where I can buy carb gaskets. I need the gaskets only, I've rebuilt the carb with a kit but would like to take the carb back apart as I am still having problems. The gaskets are deteriorating as I take the carb apart. 1985 Mercarb, 2 barrel. Engine starts great, idles great. stumbles at about 2000 rpms. after about 45 min. of running the motor will start to stumble and will eventually die. It will restart but not go past idle. I have tested the fuel flow at idle, replaced coil, plugs, points and condenser, set timing. After warm up, does the electronic choke do anything?