Hi all my mk2 multipla is misfiring on tick over.if I rev the engine it seams to go.Holding the throttle at 1200 revs will cause the revs to drop or rise occasionally.I have just fitted new plugs and coil plus new map sensor and crank sensor so I know it is none of these.Has anyone had this problem with fuel trim bank 1 and o2 sensor bank 1 codes as it is driving me crazy.