Coolant temp sensor
Your ECU is telling the truth. My 87 N/A car had the same problem, poor running, code 22. I reseated the plug on the coolant temp sensor (two pin plug on thermostat housing next to the timing belt cover) and it worked for awhile. My ECU harness is basically brittle from running in a desert environment for over 10 years so I had to splice in two new wires and the problem was solved. The temp sensor is probably OK, it should read between 200-400 ohms when its warmed up.
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