Granted I don't know a lot about cars... but...

I was having some very minor idle issues with my 1999 I30t so I replaced the plugs with some bosch double platinum plugs (tried to save some $$$). The car ran like total crap!

I replaced them after just a couple of days with the NGK laser platinum plugs. My god, what a difference! The car is running great now!

Stick with NGKs, I won't be making that mistake again.

 

Oops, forgot....

On the other hand, I did recently put generic bosch platinum plugs in my 1996 Max and it it seems to be doing well.

 

Get rid of the Bosch plugs in the 96 Maxima and put the platinum NGK plugs in there as well. Do you not realize that both of your cars have the same engine?

 

If you dont want to pay for NGK plats, get the coppers instead (less then $2/each)

http://maxmods.dyndns.org/index.php?MaximaSparkPlugs