Your MAF could also be oily and needs cleaning. These are side effects of running with a failed or failing AOS (fouled plugs, dirty MAF) - oil gets into areas it shouldn't and causes issues after the AOS is changed.
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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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