[s-cars] Apikol coil kit failure question

[ron kirkham]

For those of you with this kit, I have a question on coil failures.  I have
the modified coils that were supplied with the kit (not the high HP kit, the
normal HP kit) and an extra for the inevitable failure.  This kit was
purchased in October of '07, and I have the -115R coils.  Plugs were
replaced at the same time as the coil install with new boots.  Victim is my
'93 S4 with 235k miles.

My question is, do the coil failures "feel" the same as the original stock
coil/PSO set up?  I am getting a higher rpm, heavy load studder
(ocassionally) that feels very similar to previous coil failures I have had,
but this is my first issue with this new set-up.  What is the best way to
figure out which coil may be failing since this only happens when I'm heavy
on the go pedal?  Do I just wait for the coil to fail at idle so I can pull
injector plugs?

Also, I don't beleive this to be the ignition switch related shut-off that
many have reported, it's not nearly that severe.  Just a slight
studder/stumble that doesn't happen if I'm not heavy on the gas.  Besides,
as preventative maintenance, I replaced the ignition switch with an Audi
fresh one about 1.5 yrs. ago.  Not to say that could not be failing, but I
don't think it's that.

Any input appreciated. TIA

Ron Kirkham
93 S4, with the stumbles to start '09
95.5 S6A, safely garaged