^^
First of all, I learned my lesson with all the mecanics of my region(I dont wanna bless someone here, 'cause I'm sure that those mecanic are good, but not on my car)!
That is why I will be the only rare personne touching my engine and that for a while: silverstar inspected it first = they didnt found nothing fishy, then I bring it at this other mercedes specialist = nothing found. All of that had cost me ALOT of money! Beleive me! Diagnostic cost alot around here!


But thanks for your answer, here is mine:
the mixture is great and that always: at idle and at 4000rpm. Under load or at idle. I have a portable scope and I just had to plug it on the O2 sensor while driving (not a big deal).

But I didnt said that valve where ok (only that the timming, clearance and compression is perfect).

The engine is only missing when engine is cold and on WOT (on but condition at the same time)... at least I hear that PUFF-PUFF-PUFF.

Anyway the Mixture isnt the problem: I changed the FD, the EHA, the O2 (2 times), the AFM...and checked every sensor... but the question isnt there 'cause the mixture is good (even under load).

EDIT: Btw, my mixture is richer on WOT (but that is normal)

Air filter is new, no restriction.

Still that gas fuel smell (even on idle)... Could it be mecanical inside the engine?