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I had similar symptoms a few months ago - stumbling idle at stop signs or stop lights. Engine ran fine otherwise. The cam deviation on bank 1 eventually was so far out of parameters that the CEL was tripped. I was close to local indy shop and dropped off the car where they eventually replaced the timing chain tensioner - part #99610505158. Car is an ‘02 base with 169,000 mi. Runs great now -
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2002 Boxster base - Seal Grey, 5spd trans.,ROW M030 upgrade, FVD Brombacher software tune
2004 550 Spyder Anniversary Edition, #1541,Tip, TechnoFix DOF IMSB upgrade
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