I have just experienced a loss of power when accelerating and going over 3000 revs, the car feels like it is misfiring I have no engine fault lights on.

The car was serviced about 3 weeks ago and has done aout 94000 miles new cam belt at 80000.

I filled up with diesel from Sainsburys Watford dome roundabout two days ago and have done about 100 miles since then, so I am concerned it was faulty fuel.

Any ideas would be appreciated....