[s-cars] Violent Deceleration Under WOT

[Dave Forgie]

Tim:  It may well be the MAF but I believe you have described the
symptoms of a split "michelin man" cross-over to intercooler hose.  The
split will be in a valley of the corrugations (due to an accumulation of
oil and rotting of the rubber).  Under low boost pressures, the split
does not open up. However, as you push the throttle down, the split
opens up and releases all the boost, severely slowing the acceleration
of the car.

You need to remove the belly pan and the remove and inspect the MM
hose.  Bend it a bit until you can see the splits.  I am quite sure you
will find them.

If not, try the MAF connections as suggested.

Dave F.