Massive vibration at 1800 RPM

[Nunfa1]

Hi there, my 2.0D S40 2005 has started giving vibration through the steering wheel. It started lightly at about 65mph but stopped at 70. Today is got much worse and the accelerator vibrated also, this happened again at a lower speed but around the same rev range.
It also has a bit of a flat spot when accelerating hard, this has been there for quite some time now. Start up idle is lumpy which improves when warm but does not go completely.
I've done 92000 miles now and apart from an alternator had no trouble, my concern is that the DMF might be about to fail.

[grass hopper]

the vibration at speed will more than likely be wheel balance problem or a tyre problem,

if the DMF was failing it would rattle or the engine would vibrate when reving stationary.

[Nunfa1]

I thought it might be wheel / alignment related while it was only at 65mph, this happened before and was fixed with a realignment when my tyres where replaced. It was at the low speed that it concerned me as this is new. There has been some bad road noise since my front tyres reached 10k miles old so there may be a problem there.

Thanks

[jasonb]

Wheel bearing?

[Nunfa1]

Wondered if it might be a bearing when the road noise first started, although since then the car has passed the MOT and I would've thought the bearings would be checked.

Thanks

[jasonb]

May still be a wheel bearing!
Try swapping the front wheels to the rear and see if this improves?
When you get the vibration, take it out of gear and coast, any change in noise other than engine revs dropping?