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			You said the "car has little power", so if it begins to shake and rattle under load, I would say its a coil...   I've seen some take a few minutes of driving before it spits a code.  If it was still accepting proper throttle response and power I would say its something else....
		 
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 Previously owned:
 2000 Boxster S 3.2  Ocean Blue / 1974 911 Targa Silver
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