I've had a mint s1 for 4 years and after 2 engines 4 boxes 3 brains 4 air flow meters, fuel pumps, throttle sensors, coils filters plugs and anything else that can be changed i still have same problem, pulling slowly and cutting out at 3000 or 4000 rpms, rev counter drops to 0 and no more go. Lift off accelerator dump valve goes off and car runs fine again. its currently got a 242bhp power engineering engine and chip which was bought from a friend. it still doesnt go anywhere. im thinkin of fiesta efi management cos i got a need for speed (and CHATTER) could you possibly help me before i get a nova urgh!!!!!! any help would be appreciated