Originally Posted by tofast2belast

i have the same problem! I cant figure it out either. mine also occurs if say im cruising in 5th or 6th, then downshift to 5th or 4th and start to accelerate, it will what feels like a misfire. no codes either. I have had this problem since i got the car, I have changed plugs, injectors(stage +2 APR) catless exhaust.

only thing i can think of thats left is a coilpack issue. so maybe if the OP has same issue then could also be a coilpack.