Have a 2004 xc 2.5t -new turbo -new PVC system. Just recently when driving at 55-60 mph and slightly accelerating the car will stumble or miss. Only happens under light load .if I floor it All is well and car accelerates normally . I put on reader and no codes. I'm thinking a coil pack is going ? Anything else to check or replace? Problem seems to slowly be getting worse.
Thanks

 

Think I found problem ! Pulled plugs (original ? At 118k) they were slap worn out. Put in new Bosch plugs car is so much smoother. I need to get on the interstate to confirm stumble is gone...

 

Jacksonbase, SAME issue I just noticed this past week. Mine has 103K on it (06 2.5), and I was traveling the same speed you were, I gently accelerated and felt that slip/stumble - since I also have a couple recent noise issues, I was concerned this was a transmission issue or something disastrous.
Did your new plugs fix your issue? I am sure mine are the originals too. I am curious to hear. Thanks!

 

Yes I have run thru a couple of tanks of gas and stumble is gone. The plugs were original that I replaced. After pulling the first one and seeing the gap I new they could be the problem. Each coil pack appears to be in good shape. It took about 1 hr to replace plugs FYI I did not remove turbo pipe coming over engine just loosen 2 screws holding it in place and you can remove cover and replace plug underneath.
Jacksonbase