My car was running great until yesterday . I was doing a 600KM highway trip from Melbourne to Canberra and I topped up from half a tank of 95 at Albury APCO. After that the car would hesitate under light acceleration. The weird thing was cruising was fine and If I planted the foot acceleration was fine as well - it was just light acceleration where the jerking was. I suspect a clogged injector. I thought maybe the fuel was mistakenly the lower grade so after having just over a quarter of a tank left I filled up with 98. The jerking improved slightly but was still there. I am going to run down to a quarter of a tank again and this time I am going to try injector cleaner fluid. Sound like a plan?

 

Incidentally also my my 2.1L X-Type (and not long ago) I drove about 90km and arrived exactly at my destination, when the engine cut out when I was turning the car around to park on the other side of the street.
I parked the car, and 10 hours later, when I wanted to drive back, the car would not start anymore - just a few turns of the engine, with just enought power to drive 5m (meters!) and not more.
I got towed home, where I quickly found the issue: Simply a blocked fuel filter (and it is very easy to change, too). If they have not changed the way the fuel filter is connected between 2006 and 2009:
The fuel filter is under the car, in the rear section on the left. You just need something (small screwdriver or similar) to press those blue squares in to allow you to remove and swap the fuel filter...