Vauxhall Twenty Five car cutting out while driving

While I am driving my engine light starts coming on and of flickering then the engine cuts out while driving I have to pull in and stop car when I go to try to start car I turn key to put ignition on ignition cums on then when I turn key to start car the starter will not turn on to start engine while I belive the car has a fail safe when it cuts out it won't turn over for a few mins till it resets itself.my problem is why is car cutting out?when I have car checked the engine mamagment lite said the engine mis fired on all 4 cylinders and o the last code suggests a fuel system fault it does not pinpoint what fault,I have had the fuel pressure checked and it is Cuming in at 3.8bar Pressure while pressure should be at no more than 3bar pressure I need to know does this make the car cut out with to much pressuer or is it OK to run with high pressure and the problem is sumthing else?let me know please