i got a clio 1.2 an recently when you go to pull off and put the power down the car just judders and looses all power then will go back to normal, recently its been doing this but on the motorway today in 5th gear doing 85mph the starting juddering again the little engine management light in the bottom right corner was flashing but only for a few secs, can anyone help, im thinking maybe something to do with the coil pack, as spark plugs and ht leads are brand new by a renault garage.. please help