The car runs rough at idle and rich on the left bank; I also have codes for miss fire on 5 – 8 cylinders. I have check vacuum and vacuum leaks, compression, had the injectors checked and cleaned, o2 sensor replaced. Plugs and boots coils have been check and/or swapped with other side and I still can not get it to idle correctly. If I watch pulse with on the scan tool the left bank is 3.5 ms or so and the Right Bank is 2.5 ms. Every thing leads me to the computer but I am not sure. Is there a way I can test further or someone I can send the computer to and have it check out before I just spend the money on a dream or am I looking in the wrong direction. Could I be missing something? What else could control the pulse with like this? car has 27000 miles on it