Oil Pressure Switch Fuel Pump Back-Up
WARNING: This page is about a different car, the 1992 Oldsmobile Toronado, 1992 Cadillac Eldorado, and 1992 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
With engine idling, disconnect fuel pump relay. Engine should continue to run through oil pressure switch back-up circuit. If engine stalls, check oil pressure switch and related wiring.