I was driving my 94 toyota p/u & it just died like it stopped getting gas. i think something may have come loose.any idea on what to check?

Check your battery and alternator connections for tightness. Does it crank over, but won't start? If it won't even crank over, then likely some connection did come loose, like an alternator connection, possibly your fusible link (near the battery).
If it does crank, but won;t start: You'll just have to start from scratch to find the problem. Try to determine if it's fuel or ignition-related. Check for spark at a plug wire. If you have spark, then ignition is not the problem. Check if your fuel pump works. When you turn key on, you should hear the pump buzz on for a couple of seconds. It should also be on when cranking and running, but you can only hear it, or should, when you first turn key to on. If your toyota has a schrader valve on the fuel rail (a valve for checking pressure-it looks like a typical air valve, like on your tire, but is for attaching a fuel pressure gauge) if it has one punch the center with a little screwdriver-gas should shoot out if you have any fuel pressure, If not, have your fuel pressure checked.good luck.