Another Bucking Quattro

["Horch, August" <Horch.August@tci.com>]

OK, new symptom on the beaut.  The POS must've reallized I'm ready to
rip the trans & rear diff out of her, so she's decided the engine needs
some attention first...  Anyhoo.  The patient is an '88 5kCD TQ, MC
motor.  Couple tweeks, shouldn't affect the prollem.  Under any amount
of boost, from .5 bar up to 1.7 bar, the car will act like it's hitting
overboost, and the fuel pump is shutting down.  I don't know if that's
what it's doing, but that's what it feels like.  Does not happen when
the car is cold or warming up, happens bad when the car is warm, but
after being warm for a little bit the problem is not as bad.  Still
there tho.  Pulled the computer codes, 2113 is the only one.  According
to the Book of Robert, the Hall Sender is the prollem.  It's been
dumping snow here since the weekend and my garage has an immobile
propeller-mobile residing in it, so I haven't done any more digging than
that.  I did try the Dave Head method of playing with the plug on the
distributor, no dice tho...  :-(  A healthy dose of Techron hasn't
helped anything either.  As an aside, if you left foot brake the car &
tromp the gas to build boost, it does the same thing.  Feels like it's
shutting off the fuel pump.  A friend of mine discovered this a couple
weeks ago, I didn't think much of it 'till this new prollem cropped up
on Saturday.  It used to only cut out if you left foot braked the car,
flooring it (1.7 bar) the whole way up the East bound side of I-70 to
the Eisenhauer Tunnel (will only mean something to Colorado-ers) never
made it hit overboost.  Anyhow, anyone make anything of all of this?
Looks to be getting nice outside so tonight I hope to troubleshoot the
Hall Sender...  TIA for anything else to check!

-August