Hello Martin, unfortunately we have no solution for the problem you mentioned. We know about that, but up to now we had no car with such problems. One day we had in a GDI Plus 4 with running problems on the fourth cylinder, but we couldn`t really find a fault or defective part. So we did clean everything, even the inlets and injectors. They were contaminated with oil and condensed water and some dirt. After cleanng all that, engine ran fantastic again, customer stated it ran better than before. But that only has been one time with such problems. So I`m sorry not to be able to help with this one. Frank
