Jeff: My thoughts and experience on your problem.......
This happened to my 444 after 6 years of inactivity. Small rust particles were dislodged from the fuel tank. I installed a second inline filter before the fuel pump and it clogged within a few weeks. The symptom was exactly as you've described - loss of power, engine stalls, wait a minute, then engine starts. After doing this a few times, I realized that if I kept the speed down (I live in the country), then I was able to limp home without a repeat of the symptom. Needless to say, when I removed the extra filter, it was clogged.
I'd at least replace the external fuel filter that might clog when a higher volume of fuel is expected. The earlier AC fuel pumps had a sight glass that would trap contaminents from the fuel tank. I now keep an eye on the glass and clean it out when I get sediment in the fuel pump. I drove 1,000 kilometers on the weekend without a problem! Good luck.
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