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Old 01-20-2010, 09:58 AM   #5
jmatta
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Join Date: Nov 2007
Location: Chicago suburbs
Posts: 1,675
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.
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JGM
2002 Boxster S
1973 911 Green FrankenMeanie
PCA DE Instructor circa '95
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