hi all can someone help,i have a 2013 astra j 1.4..recently when driving as im putting my foot down on the accelerator the car is jugging,ive had the car 6 months from a reputable dealer but only got 6 months warrenty which has now expired. the car runs great apart from a bit of jugging when i accelerate,i thought it could be the coilpack or the spark plugs,bearing in mind it was serviced before i got it. the car has just over 32000 miles on the clock. the engine management light is not on.does anyone have any ideas. does this model have a egr valve that could be full of crap..anyway any ideas welcome. thanks.