Misfire?

Driving on the motorway yesterday and put my foot down to accelerate from 90kph to 120kph and car was quite sluggish and stuttery, since then even on a light throttle cruise the car feels hesitant. I thought the gearshifts were getting a bit jerky recently but just put it down to the age and mileage (5yrs old, 225k) and the car recently had a crankshaft sensor replaced (by Skoda). Has anybody experienced anything similar in the 1.9? I'm running "worst case" scenarios in my head at the moment, like injector pump, injectors etc. Obviously as it's the Easter W/E I can't get anything done with the car until next week!