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			With the car started, battery diconnected, it idles rough.......
 If the alternator wasn't dead before, it is now. The battery acts as a voltage buffer for the electronic system; you remove the buffer and the spikes kill the system.
 
				__________________JGM
 2002 Boxster S
 1973 911 Green FrankenMeanie
 PCA DE Instructor circa '95
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