[V8] Clogged Cats? - '90 V8q

[robert.a.dupree at jpmchase.com]

Hey all,
        Sold that '90 V8q I sold long ago started acting very strange for 
it's owner.  I was out there to take a peak and I'm thinking that it's a 
clogged-catalytic problem based on what I can see from the outside.  I'm 
looking to see if anyone has alternate ideas. 

Description:
a.  car starts up from cold perfectly
b.  warms up fast in water-temp, faster than I've ever seen
c.  exhaust flow at the tip seems minimal air, but super-hot.
d.  car is drivable - but a bit sluggish
e.  after 10-15mins of steady cruise car bucks, tach drops to zero, will 
maintain some drivability with held throttle poz.
f.  a few miles after 1st buck event car dies & won't restart until cool.
g.  when cool all is fine by cycle is repeatable.

So if someone can reply and let me know whether or not this sounds like 
clogged-cats or something else I'd appreciate it.

Robert A. Dupree
      Investment Bank Technology & Control
      Mgr Chicago DBA, Unix & Wintel SysAdmins
      JPMorganChase
           (312) 325-3587 desk
           (773) 203-2886 cell