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Bob,
My 81 240 (K jet system) did the same. It turned out to be the inductive pickup in the distributor. It failed intemittently as you have described and then it finally failed all together.
At a different time, my main fuel pump started making a loud humming noise, I thought the pre-pump had failed and it turned out to be corroded electrical connections at the fuel tank access port. Check the connections before you open the tank to replace the pre-pump.
But right now, I think you may have a failing or failed pickup in the distributor.
Larry
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