Engine runs for 10 minutes and shuts off

My car will start and run, no problem, after approx 10 minutes the engine will cut out it will continue to start and cut out again. It is a fiesta rs turbo 1990 after the initial start it will continue to cut out again at any time up to 10 minutes variable. Its had new plugs, ht leads, ignition coils, all relays in fuse box, checked all fuses, fuel pump, fuel supply to injectors, accident emergency fuel cut off to injectors, wires were slightly burnt due to bad connection, initially by passed the switch but have now put the switch sensor back in place. Unplugged all electrical connections checked and replaced, checked pressure regulator and replaced ecu. After doing various tests have found that the fuel is being cut off at the injectors for what reason I do not know, any help would be appreciated, thankyou.