OK. Sounds like a typical issue for any modded C5. I had to fix this on my car a times
The table that needs tweeking is called the. "THROTTLE FOLLOWER"
It has tables for both in gear and for P/N
IF your engine wants to die. You would SUBTRACT a % from the entire table for PN or in a secific gear. You can also isolate the specific gear where it wants to die. 1st 2nd 3rd or4th



I would start by removing 10% to all the tables in gear and see what happens
The change happens instatly and requires no learning
IF you go to far the eng will have the opposite affect and you will get a
"HANGING IDLE" If thathappens just keep adding back a few % points at a time until it feels right . It's truely a trial and error procedure
let me know-----Tom
PS. on my car I think I endedupwith like a minus 15% in gear and a minus 10 inpn
my car is an A4

Hi Tim, my name is Craig DUncan and I travel weekly between my home in Atlanta and home in Savannah so pass right thru Dublin. Are your headers still for sale? If so, I'd like to come by tomorrow and get them from you? I can be reached at 678-687-3999 or on this forum or at craig@knotbeforenoon.com. Thanks man and look fwd to hearing from you.