Misfire at 4000 rpm

Friends peugeot 307 1.6 hdi I have a 110 hp vehicle. Nowadays, the vehicle kicks at 4000 rpm and above. 2 days ago antipolution gave the fault error, but today the warning is back. It never kicks in the lower ages, there is no problem in traction, but as soon as it comes out in the upper ages, what is the problem ... mrkync 2016-09-01 22:01:17

it could be a fuel related situation. I suggest you have the injectors checked.