[s-cars] Violent Deceleration Under WOT

[Tim Larson]

After turning turning into the next lane today and pressing about three
quarters of the way down on the throttle in third gear around 35 mph, I
accelerated briefly til maybe 45 when the car experienced what felt like
engine miss but much worse.  Then, just a few seconds later I accelerated
hard from a full stop in 1st and at about 4k rpms the car felt like it hit a
brick wall, snapped my neck forward, really nasty and unpleasantlike.  It
actually felt like instantaneous full brakes.  There was no squel of the
tires as if they had locked up either.  Tried it again after shutting the
car off for a bit and it didn't happen anymore.  Just wondering if anyone
else has experienced anything else like this.  Seems like something I should
worry about, because I don't want to lay off that wonderful throttle.
Thanks much,
Tim
'92 S4