Dallas Fort Worth 5.0 Mustang Club - Getting misfire codes after header install

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jrodri4566

02-04-2018 02:27 PM

Getting misfire codes after header install

Hello,
I recently installed some headers on my car, got a tune. And now I am throwing misfire codes: P0300, P0308. Not all the time has only happened twice so far in a 1.5 week period. Any input of what could cause this please let me know.
Thank you,
J-D

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