The plugs on the ECU should be yellow if its an 88. Also the plugs from the harness that plug into the ECU should be yellow also. If they are grey, then you have a mismatched harness and ECU. You need to have the same year engine, ECU, wiring harness, and chassis for it to be somewhat plug and play.
87-88 - Yellow plugs
89+ - Grey plugs
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