Unless his engine is a V6Hey mate
You can carry out a quick test by individually unplugging/disconnecting each coil.
when you disconnect the coil the engine revs should drop.
if you unplug a coil and no change in the engine rpm occurs then you've found your no good coil
Sorry, it was not my intention to highjack this thread but i wanted to come back and provide a bit of an update. I think i will have to put checking the coils and plugs off a bit. i got what appears to be a P0420 and P1614 code retrieved after many attempts at the pedal code retrieval method.I am having same issue pretty much on my '05 Altima, but Im having trouble getting codes from it without a scan tool. I have tried a couple methods to retrieve the codes using a jumper wire but information i found said to use pins 1 and 8...nothing