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Tifosi, those are some good thoughts. It's not the fuel filter. I put a new one in over the weekend, and I checked the old one. It wasn't clogged at all, and fuel was flowing fine through it.
I was thinking of low pump pressure, but that doesn't explain how it keeps coming back, unless it was an electrical issue. I have doubts about it being electrical, because when I sat in my barn last night and started hitting the accelerator pedal, the car wasn't moving and suddenly everything cleared right up.
I will check the tank breather valve. I have to admit, vapor lock seems to ring with me, on at least an intuitive level. I pulled 3 out of 4 plugs when it was giving me fits and all were dry, and I'm betting the one under the air plenum would have been dry too, if I had pulled it. There was no trouble starting, so it seems like I was getting fuel and spark to all cylinders, but maybe it only seems that way because I've never heard the engine on 3 cylinders.
What sorts of causes are there for vapor lock?
Tim
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2.0 Twin Cam - Italy's answer to higher fuel prices. 
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