I've been fighting this problem for over a year now. I have a 1988 Scriocco with CIS-E with stock ignition system.
The car will develop an intermittent misfire that gets worse over time to the point the car will barely run.
I replace the Ign. Module and it then runs OK but again after a while the same thing happens!
I have tried various brands of replacement modules, from OEM Bosch, to Merle, to others and they all seem to die, some faster then others.
This is a car that I race in IT and at this point I'm about to just take it out and shoot it!
I'm done racing this year and if I can't fix it then I'll sell the car or it's parts and junk what's left.
Can anyone help me?