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      07-25-2021, 08:27 AM   #13
hellokitty
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Drives: '17 M3 ZCP DCT
Join Date: Jul 2010
Location: Southern California

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These cars are super duper sensitive, especially if you are tuned.

I would gap to .022 on NGK 97506s next time. Also change out your coils while you are at it.

Make sure you also run fuel additive once in a while and use ethanol treatment every tank if you run full e85 some day…
There is absolutely no need to change coils unless needed. A bad coil is a bad coil.

Could be your intake; common problem on the aluminum intakes.

I would also assume plugs.
Coils lose peak performance over time. You don't need to wait for a misfire to replace it. If the mileage is high, might as well do it at the same time as plugs.
12k miles in 3.5 years, doubtful it's the coils, but I'll have the master tech check.
12k miles total on the car? Then you are fine.

I replaced coils at 35k after gapping plugs for full e85.
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