IIRC, I've read somewhere that the barndoor (throttle air plate) that is located where the airbox meets the AFM box may sometimes not open completely at WOT, which would probably cause your problem. You should probably remove the airbox and test your barndoor, and make any adjustments as necessary.
__________________
STONE
'88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.
Deny Everything; Admit Nothing; and Always Make Counter-accusations
|