I drive a 2004 mazda3. It has 49000 miles, v4 2.5 liter engine. My car will stall while I am driving even when my foot is not on the clutch. It will also jerk wildly when I am in low RPMs. If I can get through first and second gear, I don't have any problems but as long as I am in first or second, I have no idea what to expect. Do you have any suggestions?