I have a 2000 S80 with 130,000 miles on it. I went to pass today and it hesitated a little bit. It continued to run, but started to act like it was missing. I just changed the plugs and it is doing the same thing. It lobes at idle and will hardly run at all unless you give it some throttle. When you drive it, it has very little power and it runs rough. Can anyone help with this. When I changed the plugs I noticed the turbo intake tube on the drivers side had a little oil on the inside of it and was a little dirty. Can anyone helf me? I just checked and it has a 1238 code in it.