Misfire at fast acceleration
New here and it's my first post but I have a 2009 e90 335xi on stage 1 jb4 tune and I just replaced my ignition coils and spark plugs maybe 2k km ago due to some misfires. It was fast fixed then but came back now only when I would accelerate really fast. Would be around 0km-20k to full throttle. The check engine light would turn on for a second and would go away. Sometimes I would have to turn off the car and turn it back on to clear the light. Keep in mind this doesn't happen all the time but sometimes. Any idea what's going wrong? I'm really hoping it's not an injector.
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