I have a 2002 Audi A-4 3.0 Quattro with just over 90,000 miles that has been giving me a few problems recently. I changed the spark plugs over a year ago. I have been getting codes of cylinder five and six misfires. I switched out the coils and have not gotten that code yet. But the main problem I am having is it is running a lot louder than normal and seems pretty sluggish. When I turn the car on the engine noise difference is obvious. When it is shifted from park to drive, the car gets even louder and louder still when it is shifting gears. It is a noise coming from the front of the car and sometimes sounds like a gargle noise or something. The codes I have gotten are: 17755, p1347, 16815 (p0431), 16584 (p0300), 16689 (p0305), and 168254 (p0441). Any and all help will be greatly appreciated. Thanks much.

 

Check you muffler and cat/ precats they could be on there way to collapsing