Hi,my 240D mercedes is dying out seems like its running low on fuel,sometimes it might even completely die and i have to stand like 20 min untill i slowly start it back up,and sometimes it runs great,really easy on the throttle and still runs good and i times it feels like its just loosing power and off and on,sometimes i can even slow down to like 45mph on the freeway and than slowly starts going after a while,i already changed the both fuel filters a couple times,changed airfilter,oil,gas cap,i dont know and i put injector cleaner in the tank because the previous owner ran it on veggie oil,now its completely running on diesel,ive been told to flush the tank and clean it with diesel or the injectors can be bad or cloged up...can you guys please help???