94 mercury sable want crank,,relay box mounted on the hood keeps rapid clicking

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complete distributor replaced alone with wires and spark plugs and it still will wont start. so i had a guy to check it out and it started and ran around the block once. then it would not start and if it did it would not stay running, i have a new Constant Control Relay Module, the little back box mounted on the hood, so when trying to start it, i hear the box keep clicking and the fuel pump keeps humming, even if it starts for a little while the box wont stop clicking. someone please help