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There were a lot of changes for the M103 that occurred starting in the 1990 model year. They didn't get the intake air temperature sensor or the EGR valve or the smog pump until that time. That's why your 89 doesn't have them. There were a lot of other changes at that time as well. For example, the ECU is very different and won't interchange. I'll bet that's when the change from 2 prong to four prong CTS occurred as well.
As JohnM and I can attest to, swapping a seemingly good ECU out for another one or two or three (in other words, try a few) can often cure these phantoms in the machine.
Sorry I can't be more help.
Regards, Eric
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