hi i need some help ive got a 2004 350z
which has got an k & n air filter and cat back after market exhaust
the other night whilst driving i got a miss fire and every time i tried to accelerate the eml would flash
got the car home slowly next day started car and eml stayed on
car was booked in to have service so asked them to investigated the problem
i was told by the garage that the codes were because of the after market exhaust and air filter
and the eninge would need remapping to support these
i have rung a couple places but have been told that this isnt the problem and do not need a remap
any suggestions