I have a 1992 300E. When the car gets warm it starts to choke. I can only manage to drive it about 3 miles. If I give it only a little gas I can manage to get home, but if I drive it normally, it will stall. It will start again no problem but it just keeps choking. I put in a new O2 sensor and new fuel pump. That didn't make any difference. Can anyone give me some advise? Thanks