My truck ran like a top for 25 years, then one day it started running weird, popping sometimes gas would pour out of the carburetor, sometimes not, I did everything from new gas tank, new lines, new points, condensor plugs, wires, three different carburetors, propped the heat riser in the opposite position it was in previously, (don't do that !) nothing helped. Then one day it started up and as ran like it always has. Still no idea.
