[V8] V8 won't start when engine is hot!

[jpb3wvu at frontiernet.net]

Hi guys, haven't posted in a while since I moved on to a 20V
Turbo but I have an issue and need help.  Both Audis decided to
sh*t on me at the same time.  S6 siezes the rear caliper while
fiance is driving it and proceeds to turn the rotor into
hamburger, and the V8 which I just put back on the road last
week will now not start when it's warm.  The car always started
very quickly since I have onwed it the last 5 years, I mean like
in 2 cranks, but now all of a sudden will not start when the
engine is warm.  When it is cold it starts right up, like
nothing is wrong.  Any insight out there as to what this is?  I
have not pulled any codes b/c I never have and don't know the
procedure.  If I recall correctly from my 4 years of lurking on
this list does a engine speed sensor sound like the problem? 
Thanks for any help.  I am currently stuck at home b/c both of
my Audis are down.......this sucks:(

I must be sadistic to have 2 of these 4 ringed bast*rds!

John