hi i was wondering about ecu part numbers.. i have a 98 a4 2.8 quattro ecu part number 4D0 907 551 AH, then theres the BOSCH # 0 261 204 346.... i got one with exact part number and is running very sloppy kind of like a bad misfire sometimes turns off... so theres this other part on the ecu that reads motorsteuerung D02.... and the one reads BENZIN D03.. DOES THAT LAST PART MAKE A DIFFERENCE?. or what does it stand for?. any help will be greatly appreciated thanks a lot in advance..