Pre-glow control light flashes with running motor (Accord)

Hello, I got the car (Honda Accord i-CTDI Bj 2004) this morning and started normally, when the engine got warm after a few kilometers and I got hit by a traffic light, I noticed that the speed does not come over 2000 rpm and the pre-glow control light flashes. Then I turned off the engine and set it up again, what is… the light didn’t flash more, but too soon pleased, after a few 100 meters it started to flash again. Unfortunately I only started to flash again. or get an appointment with the dealer tomorrow, so my question to you here…has someone had something similar or still had and what could be broken?? …thank you already ma in advance