If your truck is not injecting, it is surely out of point, controls the set -up of the distributor by lamp, if you touch, as you say that it makes counter -eating in the carburetor, cross the cables of the central cylinders, that is, it puts the cylinder cable 3 in the 2 and vice versa, go and give it some accelerated, put it correct again and if it improves the tank. 10% of the load in acetone, walk a little to be cleaned, but set the tuning because it must be late ...
Salu2