Engine 89 GT Dies at idle, surging around 1-1.5k while cruising

So far, after initially dumping the codes, I did the surging idle checklist. From there it we determined a new injector wiring harness was in order. I installed the wiring harness, set base idle, removed and cleaned IAC, and cleaned MAF.

Before continuing to chase my tail on getting the rest of my problems taken care of, I’d like to dump codes again and see where I’m at. I have the black and yellow innova obd I code reader. The first time I dumped the codes it took some creative positioning to get it to work. This time starting with the koeo test, I’m getting nothing. I know it’s not a bad ground and it’s communicating with the computer because when I press the test button it runs the fuel pump. No matter how long I let it sit it only reads 000 and never dumps any codes or 10 for all clear. Any ideas?
 
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