Originally Posted by
chrisgcombi
Engines been well looked after , had a tuning specialist as it was runnin rich and he said it looks like some one has spent a lot of money on it .
Could it be anything to do with ecu or boost valve or injectors etc as i am stumped .

It's unlikely, a fault with the above would cause a running issue, not just a power loss. you could send the injectors away for testing and cleaning or buy new ones but i doubt it would make much difference. a fuel filter change would be worth a shot for the few quid it costs, but i'd stake my money on a worn cam