Ihave 1988 buick lasebra, and it keep cutting off,

If this occurs only when hot check for spark if there is no spark on all cylinders the problem may be the ignition module under the 3 ign coils. also check the crank position sensor for contact with the reluctor on the harmonic ballancer , this is on the lowest pulley for the serpentine belt near the bottom of the engine . DO NOT REMOVE the sensor for inspection , allignment is critical.. check fuel pressure, should be 30 to 35 psi. should stay between this pressure all the time while running.. if not fuel pump may be faulty...good luck