dead sundance and duster after going over a bump

I have a 1993 duster and a 1993 sundance (the parts car I bought to hopefully fix the duster). Both 2.5 litre non-turbo.They both died after going over a bump. No computer codes (as in it does not display ANY flashes of the codes!), engine turns over great. I bought the sundance for the computer, coil, distributer etc. IT IS NONE OF THESE! It's also not the relay set under the hood. Anyone know what the problem is? After a big bump- instant shut off never to re-start again! fusible link??? help!!!