Hello All,

I am new to the forum and I am encountering an issue with my 2011 S60 T6 185,000km.

It began one morning on the highway where the car began to shudder and misfire - "REDUCE SPEED OR SHIFT UP". Pulled off and could smell a burning rubber / plastic. Rough idle followed. Managed to get the car home (If I kept RPM's low and car under 60km/h it did not shudder). When i pulled the codes there was a misfire on cylinder 1 and 5. I replaced all spark plugs and ignition coils and there is no longer a misfire in cylinder 1. However, while getting up to speed if my RPM's exceed 3k the RPMs will drop suddenly to 2k and the car will begin to shudder almost as if the turbo won't engage. Weird thing is, I am not getting a check engine light.

Attempted Fixes:
- Replaced & swapped plugs / ignition coils into different cylinders. Issue remains in Cylinder 5.
- Checked for coolant leaks / level - all is good.
- Checked electrical connections / cleaned / applied dielectric

ANY SUGGESTIONS ARE WELCOME!! PLEASE HELP!

Chris
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'11 S60 T6
'09 S40 2.4i