Help with Audi Problems - 83 CGT, 88 5KSQ

[b1biker]

I seem to have angered the car gods. 
83 CGT --
My 83CGT started on Saturday and then stumbled/backfired and quit. It now starts and runs while the cold start valve is open and then dies. I just had a similar problem on my 84 4KS and it turned out to be a bad rotor/distributer cap. I checked these on the CGT and sure enough they were bad. Replaced with cap/rotor from 80 5KS but did not solve the problem. What is the likelyhood that the coil is the actual culprit.Are there other parts of the system that I should be loking at. It has been running fine until this event.
885KSQ --
Am replacing the head due to an overheating problem. Things are going well with the exception of removing the vibration damper so that I can replace the timing belt. Any advice on this problem will be appreciated.
Gary Meier
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