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Yeah, I'd guess ignition, and I'm guessing both black plugs are on adjoining cylinders for one of the two coils. A bad ground could cause that. Aren't you getting a CE code?
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2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
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