vacuum leak? check the float level, and float drop. Check the carb again. All I know is mine ran like crap for about 3 months I changed the entire ignition system, tried 2 different carburetors, had them both apart about 300 times. Tried pertronix, 3 times I put it in and took it out (it runs better without the pertronix) checked the timing about 30 times.I even made a set up to check how much fuel pressure I had. I did have a little tiny chunk of rust in the fuel pump, I had been using an inline filter (more like a strainer) before the fuel pump, after I had changed the fuel tank,(but not the filler neck, which has to be where the little chunk of rust came from) so after some indeterminate period of time I replaced the fuel line to the pump, and as there was no place to put a filter without cutting up my new fuel line, I took it out. Some time later is when I discovered the chunk of rust in the fuel pump, that is the point at which I dug out my fuel pump with the glass bowl and a dandy screen in it then one day it just started running flawlessly. I still have no idea what was wrong, I am just glad it is. These trucks are old, maybe they just need time to heal.
Last edited by brokenhead; 06/20/2012 11:28 AM.