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Two things here, surging could be a lean condition. But start simple, how is your vacuum advance working? As far as the MSD goes, you're not going to notice much outside of the normal CDI, Bosch did a great job on it. That being said when mine went I replaced it with an MSD, only for cost reasons.
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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