My car was takin to a nissan dealer and one of my coils are mis fired,what should i do change all 6 or just one?

 

What year car is this for? Your profile shows a 2005 Maxima SE.

 

Its probably only one pack thats misfiring, I assume you have a '99 ? You can find 'em napa for 89$ or online for as low as 69$

Id get one and swap it out one by one untill your not mifiring. If you got the extra $$$ replace all six

 

I had a loss of power so I tought it was a faulty coilpack...after a nissan diagnosis, it revealed that the MAF was faulty...even after changing the MAF (wich was 600$ CAD), I feel the same problem again...a loss of power when the car is hot (normal driving temp.) ...I changed my plugs for NGK's iridium ones and the problem still persist...I feel a loss of power in lower rpm's range (1000-2800 rpm) and it hesitates when accelerating way more than when the engine is colder....also, when WOT, it looks to take sooooo long time to revv up!!! any ideas?? BTW, I tried to figure out wich coilpack was faulty by looking at the color of each plugs but, they all look the same...can my short ram intake be the cause of all that mess by eating all the enine hot air???

please help!

thanks!