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Ben, I have limited experience on CIS 911's (I only have screwed with mine), but my '79 SC, not long after I rebuilt the engine, I started noticing that when I tromped on it and the rpm got into the 5k range, it started bucking/cutting out occasionally. My guess was that the fuel distributor plunger piston was hanging/sticking. After checking the timing and fuel pressures and driving for another week or so the problem went away, so my guess was that I just had some crap or varnish in the fuel distributor as my car had sat for a long time before I bought it.
I did later install a proper WUR that I made adjustable and a new fuel filter, but the problem had cured itself before making these changes.
I am not saying that this is your problem but I thought I would throw it out on the table just for yuks.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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Men do not quit playing because they get old.... They get old because they quit playing.
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