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No. .. The relay(s) one or two for the injectors are located in the engine-bay fuse box. They should be clearly marked on the lid of the box. I think what you are referring to are the coil packs where there are coils for each spark plug. You did not mention the type of engine it has, but I am assuming it is a v6 series.
Any time you do any electrical work on a modern computerized car, you must remove the negative cable from the battery prior to work beginning. You will have to reset your driver memories and radio presets afterwards. You have to reset your computer to reset your speedometer. On most 90's Olds, turn on the key but not to 'start', leave in 'Park', then depress the gas pedal rapidly all the way to the floor three times, then turn key off. Then start vehicle. Some models are different, though; you may have to call the 800 no. in the owner's manual and let GM walk you through it.