It may be time to invest in a code reader or find someone who has one. Pulling codes will help you zero in on the issue. A decent / adequate code reader runs $50-70. You will spend way more than that chasing and replacing parts.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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