I just got my friends MF 150 running again. I first worked on it back in the 80s, and it had run fine for years afterwards. He pulled the starter 2-3 years ago and it has sat out unDer a tree in Michigan weather for a while. Of course he had also pulled the carburetor and linkage and fuel line among other things to get access. So I went over yesterday and put the new starter on, and hooked everything going up and put new fuel in it and it started. Anyway, after a while it idled well enough, but if you increased throttle, it spit and popped and gradually popped on one or two cylinders until it finally sped up and ran on all 4 again. It ran like it was really really lean. I am confused as to why it is doing this. Could it be a problem with the distributor, like the points are shot from moisture? It also has some kind of electronic thing on the bottom of the zeneth carb. Could that be shutting down the fuel? The fuel line to the carb is not restricted. Any ideas? Thanks