I have a '50 3100 with Rochester carb one-barrel and after I use the choke, then push the knob back in, it doesn't (at the carburetor) push the choke back to the original position, making it rev. So I have to open the hood and manually move it back to it's original position. I've tinkered with it over and over at the connection point where the choke cable attaches to the carburetor (not sure about the terminology), but I can't get that cable to return the choke to the original position? Any suggestions? Thanks.