I have a problem again! For about 14 days my engine gets the big stuttering when accelerating. No more power and sounds like who 1-2 cylinders fail. Whom I take the gas away it runs again correctly. No matter whether cold or warm. Errors are not shown to me in the MID either. I have tested schonn: Zünkerzen / Ignition cable / ignition, petrol filter and air filter. Motor is the 2.6 V6. Who can give me a wise advice???