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Aaron,
Some of your description of the symptoms do not make any sense. U-Joint problems are easily determined by noise and vibration, but not surging, a slipping clutch, maybe.
I have owned a 1977 B21E with Bosch Fuel Injection. I spent about $4500 on parts and repairs to that car and a helluva a lot devoted to Fuel Injection overhaul. I have found my 1981 B21A carburetted enine more stright forward and reliable.
Fuel Injection seems to be pretty finnicky and like Windows operating system, so much is inter-dependent, that is one corrupt bit affects another.
When you bought the car, did it do it? If not, then what did you fiddle with or change?
What is required to make any engine run? Air and Fuel in the correct mixture +/-14.7 : 1 working around that gives best economy (lean) or best power (rich of lean). You need compression. You need spark. Keep it simple and work around that.
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