I have a 1990 Maxima Brougham and I was going to change my spark plugs.
Can someone give me some information on what size/type of spark plugs will be the best? I have also hear about changing the 'wires', is this beneficial?
thanks in advance.

 

IMO..the stock OE NGKs are the way to go.
you can get the NGK wires too if your old ones look worn/brittle.
if you're going to do the plugs also change the ign rotor and cap (stay w/ OEM nissan).

 

Yeah go to your Nissan dealer and get some NGK spark plugs, they are really good plugs. Make sure you blow the holes that the spark plug goes into out with compressed air before you change them, they get full of dirt and all kinds of other crap and you don't want that in the cylinder.