Hi all,i have a 2wd cosworth engine in an old escort and its developed a problem. After half an hour or so driving it,it starts to misfire to the point that i have to pull over as it cuts all 4 cylinders and pops and bangs as soon as i try to rev it. Turn it off and after 10 mins its fine. Ive changed coolant temp sensor and checked gaps on crank and phase. Its on l6 ecu running stg 3. I tested pump voltage today and its at 11.3v. But when i rev it and its missing,it bangs and flames out exhaust. Anyone any idea?