[s-cars] Misfire on 95.5 S6

[Alex Witham]

Hi S-Heads,
 
I have a 1995.5 S6 with 149k with an MTM Stage 1+ chip that has a misfire and I was wondering if any of you might have experienced similar issues and know of the resolution? 
 
The misfire occurs at idle once the car has warmed up, but not when it's cold. It also hesitates from a standing start and mildly bucks as it misfires. Under full throttle the misfire comes in and out. Thereafter, the misfire occurs under anything from about 25% throttle ore more. Also, the problem is getting worse and worse to the point that I know have to rev the car much higher in the rev range when changing gears so that it doesn't buck as I accelerate again in the next gear from lower RPMs.
 
The car has a very recent timing belt, new spark plugs, and water pump.
 
I've replaced both ignition modules which helped for a very short while, but didn't eliminate the problem entirely and it's now back to where it was before the new modules. 
 
I've pulled the coil plate and watched all the spark plugs fire in sequence without a problem.
 
Checked for voltage at the white power plugs for the coils (sorry if I'm using the incorrect terminology) and it's as it's supposed to be.
 
I've tried to do an OHM test, but couldn't quite get that to work out. 
 
Any input would be greatly appreciated.
 
Thanks,
 
Alex