ntr_s2k

i replaced my spark plug with ngk from the dealer i thought it will fixed the problem since the plugs looks bad,but until now i still have this problem sometimes when i floor the accelarator wide open at high rpm it missfire and i see some smokes.no check engine light appear on my dash and the car start and idle fine.i have 68k miles on the motor.

flyingtoaster

Have you pulled the codes to see which cylinders are misfiring?

ntr_s2k

i never had any codes.....no check engine light....

ntr_s2k

im guessing it could be my coilpack but if there bad i should get a check engine light.