What I was saying was that if the MAF were good, disconnecting it would cause engine performance to degrade. But since performance showed no difference when you unplugged the MAF, it seems as tho the MAF is not doing its job. This happened on my good wife's Maxima not long ago. Very similar symptoms of terrible WOT performance. I unclipped the electrical connection at the MAF with no difference. Replaced the MAF, she's happy again (both the wife and the Maxima).

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

You problably right since it's no problem in the winter weather that was my first thought, but since the MAF is so expensive in my country i guess thats why I hope there was another problem.