Yea the car has a 3 bar map sensor fitted Steve. I put the standard injectors back in just to find the problem mate & the missfire only happens when the green injectors I got off eBay are fitted. Is it possible( just to find the faulty injector) if I put the greens back in & change 1 at a time with a standard injector? I don't need to drive the car the misfire come in even on a steady rev. Cheers.