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Are you in boost when it stumbles or is during normal driving?
What are the plugs gapped at? Fuel press readings?
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2009 Porsche Carrera S
2008 ///AMG C63.. Eurocharge Tune. RIP 
2019 AMG GLC43..wife's
03 F250 SD.. Edge Evo, AFE Stage 1 CAI
08 GT. JBA axle back, FRPP springs, FRPP swaybars.. daughter's
01 Cobra vert... wife's
I need a new toy
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