i tought i answered.... but i forgot.
the problem is fixed.
i did a maf clamp ( 4.3v zener diode ) for 2$.
i can now hit 10 psi , afr is 11:1 - 11.5:1 ( hit 13:1 half a second only when engine is not at operating temp ) , and no problem at all.
still , thanks you all for the help