[s-cars] Diagnosing misfire cause

[David Forgie]

If I had been on s-cars earlier (Sorry), would have offered this: 

One missing and hesitation diagnostic procedure: 
http://forums.quattroworld.com/s4s6/msgs/22611.phtml 

Despite what JC suggested I might not have mentioned Steve Eiche's extensive but unfortunately futile search for replacement ignition driver chips. 

No need now. Others have done that. 

Good luck, 

PS. Good used Bosch Motronic 4A0907551 AA DME Ignition Modules aka "UrS ECUs" go for around US$300 

Dave F.