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On your '87, that relay is used in several systems. They use one for the injectors, one for EFI main relay, one for the tail lamp circuit, one for the A/C system.
90987-02004-83 - $9.26 - Relay
The easiest way to check if it's good or bad is to substitute a known good one for it, since there are plenty to choose from on the car, and see if anything works differently.
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