I have exactly samelike problem, and it doesn't mutter if the rpm is 3000 or 6000 the wave is still there.
I think it is oxygen(lambda) sensor or it might be the air mass meter(or is it air volume meter).
Could anyone tell me some webstores where to find AMM's in reasonable price?(maybe order from Germany or UK or etc.) cause here in Finland the local markets give prices around 600 Euros.
Thanks
/Sam
