Got a strange issue car was running a bit rough then completely died. Changed coil packs and plugs and seemed to run ok and then suddenly died. Then went to restart and the fuel pump keeps priming then loud click under dash and then fuel pump tries to prime again and then repeats. Then I completely turn off the car and fuel pump primes normally and then car starts and runs fine. Then suddenly stops and the wierd fuel pump priming starts again. Any ideas ?