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I am currently chasing down a 21 & 22 error code on my '85.
I was able to set the idle fine with the instructions from Lars, but I am not able to get a good reading on the TPS. I tried the paper clip method and I am not able to get a good reading. I suspect that it is due to a faulty TPS.
To make life easier for testing and adjusting, I am looking at buying the TPS test harness from MAM.
My question is this, are any of the other harnesses a good idea to buy? I ask because I may as well buy what I will need in one order to save on shipping.