Sorry I can't really help you except to say that this is typical of 190s. Mine is the same way. It's more difficult to start when it's cold and especially if it's also wet.
There is some kind of valve in the engine that controls the ratio of air to fuel which sometimes can go bad. From my understanding, it's a very labor intensive job to fix which will run more than a$1,000. Hope that's not what's wrong with your car.