I have a 76, had the same problem. Found a small gas leak in a 6" piece of tubing under the pass door. Replaced it. Needle stopped dancing prob. appears to be solved. Needle danced along time before prob started for me too. I think its from pressure being lost from the crack!!78 K5 said:Yeah, but it's done that since I got the truck and I wasn't having problems until recently
What could that have to do with the prob?
I snickered when I read this. Said thats it! PM me if u want to go into greater detail. Besides its a cheap place to start.64Trvlr said:Start by checking all the rubber lines in the fuel system for cracks and leaks.