my car idle rough when stopped and put in park then died and wouldn't start on 2002 Buick Rendezvous

it happend twice in 3 mos but this time won't start but runs if use starting fluid

If it starts and runs using starting fluid it sounds like the fuel pump isn't supplying fuel to the engine. The fuel pump is located in the fuel tank. There is a fuel pump relay in the relay box located in the engine compartment (near the washer bottle resivour . 15 Amp fuse #1 in the fuse box engine compartment protects the fuel pump circuit.