Hello.I'm having a heck of a time with my boat. I'm not a great mechanic, but I've been working on my Mercruiser 120 and have isolated a surging problem to what I think is the choke of my carburetor.I purchased a SELOC book and have set the points to spec. The boat sat for three years, so I rebuilt the carburetor and replaced spark plugs. When I set the mixture screws to 1.5 turns (as stated in the book), I've been having starting problems. With the mixture screws WAY out, there was no problem starting, but I think it was running way too rich (surging problems above 2800 RPM). The boat doesn't start now unless I manually close the choke.Looking at the literature that came with the carburetor rebuild kit, it seems that I have a Rochester 2GV. I have verified the choke unloader adjustment and have set the vacuum break.However, there should be a rod that closes the choke. The kit contains some information that 1968-1969 model Chevrolet cars had an automatic choke. What sort of setup is normal on this configuration? There doesn't seem to be any documentation in the SELOC book.I can post some photos to a website if necessary.