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With 8 kg/h you have a large leak of air coming in past the MAF. Take a look at the pipe connected to the throttle body, inspect for cracks. Also, make sure the pipe clamps are solid and tighten fully.
Also since you have INPA, you can take a look at analog values and inspect the VANOS set values versus actuals.
How old are plugs? How did you "test" them?
 
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