What led you to the diagnosis that you needed a cylinder head valve cover?
Usually engine stutter means one of the following:
Clogged up injectors
Faulty MAF sensor
Faulty camshaft position sensor
Faulty crankshaft position sensor
Faulty ignition coils
Dirty throttle butterfly
Clogged up fuel filter
Any combination of the a...
I am under the impression that the Valvetronic engines still had a throttle butterfly, even though power output is regulated with the Valvetronic. I don't know how integral it is, though. In my S60, I recently had the throttle butterfly cleaned and it was like night and day.Without the throttle butterfly. The valvetronic does without it.
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