642b was running fine, then bogged down and died. Crank crank no start. Let it sit, it starts and runs then dies. Parked it. Few weeks later it starts, runs, dies. Changed air filter, 3 of the 4 plugs ( one won't budge), new fuel filter. Ran, died... Now crank no start. I don't have the knowledge any farther. I have an appointment with my mechanic jan 16th, but need to plow snow. Is there anyone near Wautoma WI. that can help. Please!