Hi guys just driven home from work and my car (2.4 abarth) displayed this warning ENGINE CONTROL SYSTEM FAILURE.Now it drives like a bag of spanners almost like its running on 4 cylinders so i suspect a coil may have gone down.Ok how do i proceed from here please car parked up at mo.The coils i have say bosch on em so i assume that be the thing im looking at.Not much of a car expert but looks easy enough too replace.Oh also how do i determine which one it is as there is 5.All help greatly apprciated.Car has done 26k and i have noticed it sometimes kangaroos a bit when cold so this could point to it being a coil.