08 HHr SS automatic keeps giving code for miss fire on cylinder (4) new plugs, new coil
This car keeps giving code for misfires on cylinder #4. Things done are replaced coil and
plugs, swapped coil and plugs around cleared codes and in about 150 miles or so codes
back again car has no real noticeable lack of power either. Also have used chrvron
injector cleaner in a couple of fill ups..