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Old 05-23-2024, 11:18 AM   #2
ctrlz


 
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP
Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,584
Is the tuner road testing the car? it sounds like you have a vacuum leak that is coming and going as parts shift around. I would guess intake, as there have been multiple reports of leaks around MSD intakes here.
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