I have not seen that problem. You might consider picking up the factory service manuals. They go for about 20$ on line. They have trouble shooting flow charts that are pretty good. If you are up for it then that would be best unless you take it to a shop. If you look you will see that you might get only 1 reply or none from questions on this forum. Most folks just don't wrench on then benz's It take specialized equipment for the FI system and most folks don't want to pony up for a 1 time repair. I bought the fuel pressure kit for a 100$ and used it once and will probably never use it again is one example that I offer up.
Good luck and good luck with the car.