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View Full Version : Getting misfire codes after header install


jrodri4566
02-04-2018, 02:27 PM
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