my 94 Buick wont start with key but you can jump it off the starter and it dies

There is a starter relay.......it works with the security system to keep the car from starting if someone tries with the wrong key. Assuming you have the proper key the security system would trigger the relay and when you turned the key 12v would go to the starter solenoid. You probably have a underhood electrical box and that relay should be there. the inside cover of the box should have a label with all the components identified. Usually there will be several relay that are alike, pull one for something that has nothing to do with starting and switch it with the starter relay if that works go buy a new relay.

The starter relay is located above starter wire connection. It not in a box in engine compartment. Pretty much requires starter removal to access. Should have starter tested while removed to make sure relay is the problem.