TC 88 turns extremely high when starting

Hello guys, maybe someone has had something like this before: Today on a tour after approx. 200 km noticed that the stationary gas was slightly higher than usual. I still thought: Maybe the throttle clamps … so first home. There after approx. 1.5 hours (machine was properly cooled down) times joined. Gas train tested: no result. Runs clean, and moves the throttle shaft to stop and back. Adjusting motor for the stationary gas adjustment at cold start also drives correctly. See if the throttle flaps move correctly: Do them. Starting the engine: Engine turns immediately on “full gas” when (quasi) closed throttle flaps (feeling): immediately killed. The engine also started hard, usually the machine is there immediately. In a warm condition even better than in the cold. As mentioned above: TC 88 in a RK from year 2000, i.e. Magneti Marelli injection system. Does anyone have an idea how to circle the error? Can such a symptom by defective injection nozzles occur? Questioning greetings