hi ther this is my first post. me and my dad have just put in a brand new cosworth engine into a sapphire and i was running it in on a trip away and when i stopped for lunch it cut out on me and it would not start for a while then i had lunch then whent to start it and it went second go. then it went for 7 or so minutes then it cut out. it seems to be when it is hot it cuts out. my dad thinks that it may be a sensor ( crank mabey) and i was wondering if any of you guys know what the problem could be. we are away atm so we havent had the chance to have a good look at it.