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I don't know if this will solve your problem but let me tell you an interesting story.
Back in 1999 my '57 Thunderbird developed a hesitation also. I tried several different things to correct this problem. I installed new spark plugs, new spark plug wires, tried a different coil, new points, new condenser, adjusted the timing even rebuilt the carburetor etc. Everything seemed to help to some degree, but nothing complete cured the hesitation.
In 2000 I still had the problem but I drove the T -Bird from Ohio to Chicago for the 2000 National Thunderbird Convention. I talked to several people that were at the convention about my problem. Most of the solutions that were offered are the same that you have already received on this mailing list or something that I had already tried. I then talked to Walt Nuckels who was at the convention. When I told Walt that I had a hesitation, the first thing he asked was if the accelerator pump was working correctly. I told him that I thought it was. He asked me how did I know? I told him that I could see the fuel spray into the throat of the carburetor when I worked the accelerator linkage. Walt asked if he could take a look at it.
We took the air cleaner off and he slowly moved the accelerator linkage about a quarter of an inch. He told me right then that this was the problem. My linkage was moving about 1/8 inch before the accelerator pump starting working. He made a sight adjustment in the linkage so that as soon as it moved the gas could be seen spraying into the throat of the carburetor. We then took the car for a short ride and the hesitation was gone. Walt had fixed my problem. Walt sure knew his Thunderbirds. Wish he were still around!
Reprinted from the April 2002, Bird Thunder of the Big D Little Birds club
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