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D-Jetronic runs 3 volts to the injectors. If you had a '12 volt' injector it probably wouldnt work at all, instead of occasionally failing to work. Have you isolated the particular injector yet or does it seem like a general problem with all the injectors. Or is it something with the pressure regulator? Maybe it occasionally sticks open or shut. Try swapping injectors from rail to rail and see where the problem goes/stays.
John Mc.
PS You are quite lucky to have two cars to debug this incredibly obscure fault.
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