190E in Trouble...Help Needed ASAP

About a week ago, I took the injectors out of my 8V engine but only on Cylinders 1 and 2. I looked at the condition of both injectors and then put them back in. When I started my car, it started to idle irratically and it would stall when I moved from stop. Above 2000 rpm there is no problem and the car is a rocket. Another problem is hard start. All these problems went away for about three days...I was very happy. Then it came back two days ago. I got brand new injectors, even a brand new Overvoltage protection relay. I replaced everything but the problem lives....what could it be? I have to drive 50 miles everyday to school and back and it frustrates me.