Check out my current thread. I'm still dead in the water:
http://forums.pelicanparts.com/porsche-911-technical-forum/638355-3-2-engine-stalling-stumped.html
During a recent test, where my mechanic and I by-passed the DME relay, we fried the engine wiring harness. This weekend, we'll be replacing it (for the 2nd time). Let me know what you find out, and good luck. As Kurt said, these mid 80's Carrera's are starting to suffer the same issues - what ever that may be...