What else can it be?

Does it have spark? This vehicle should have a "crash" switch which shuts down the fuel pump in case of a wreck. They are usually in the fender. Have yopu checked to be sure it doesn't need to be reset? Call your local dealer for the exact location of this switch.Make sure the vehicle is in PARK and the Parking Brake is on. Pull a spark plug and put it in the plug wire and ground the plug to the block or head and have someone crank the engine over while you watch for spark.If no spark then it may be the ECM (computer). Is it geting fuel?.

If all of the above is good run a compression check. Also considering the age of the vehicle if it has a lot of miles your timing chain could have jumped. If you have spark, fuel and decent compression the only thing left is to be sure these three things are in time. And that is the job of the timing chain (or belt or gears) and the distributer.
Assuming you got the distributer in time when you replaced it pull the distributer cap off and crank the engine over. Is the distributer rotor turning?If it is have someone turn the crankshaft backwards and then forwards by hand while you watch the rotor. when they turn the crank the rotor should turn immediatly. If there is a big lag thenthe timing chain is worn.Also then with the number one spark plug removed and your finger over the spark plug hole have someone turn the engine over by hand until you feel pressure on your finger then tell your buddy to watch the timing marks on the balancer and stop turning when the "zero" or "TDC" mark lines up with the pointer. This will be number one top dead center. At this point the distr rotor should line up with the number one spark plug wire lug on the distributer cap. If it doesn't your distributer is out of time or the timing chain has jumped. If the rotor isn't turning then pull the distributer, inspect the teeth on the gear on the bottom of the distributer and look down in the engine with a good flashlight and make sure the teeth aren't bad on the gear on the cam that drives the distributer. If it's ok the problem is the timing chain.