Ducato 250 , running restless , no power

Hello everybody, my 250’er BJ 2012 doesn’t really like that anymore. First he didn’t want to start this morning now he’s running, very restless and doesn’t take any gas. The following I’ve already done: – leak oil checked, everything in the target. Injectors were renewed in 10/15 – error memory read out, no error available – checked for leaks – control time checked, also ok The exhaust gas smells extremely like unburned fuel and smokes accordingly white. e and ran before without any problems. Maybe anyone else an idea? AGR, throttle flap ? Ducato 250 130 Multijet, BJ 2012, 170.tkm Greeting