Random misfires and engine shutdown.

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My daughters car has been suffering from misfires, erratic R.P.M and also shutting down once your foot was removed from the accelerator.

ODB II codes said it was a problem with the valve timing on the exhaust side, I ended up changing the control solenoid for the exhaust side of the VANOS system.

For the misfire I replaced the sparkplugs with new ones.

During the inspection of my plugs cylinders one through three are running fine but on cylinder 4 I found traces of oil, the valve stem seals seem to be leaking on cylinder 4 which would explain why I need to add a litre of oil every month.

you need a very long tool to get to these sparkplugs
Difference between old and new. This was cylinder 4 with some oil but no fouling,the sparkplug was also loose.
Cylinder 3 normal condition
cylinder 2 normal condition
Cylinder 1 normal condition
VANOS exhaust side hydraulic solenoid valve.

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