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How can i check the main relay on my moms 93 corolla wagon.

I think her main relay is going out becuase whenever you drive you could feel the fuel cut off and a CEL would come on but then go away. I cant grab the code because its OBD1 and it goes away. Also i have no clue where the ECU is or a jumper for the ecu.

Any help would be greatly appricated. Thanks.
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