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You will have to remove the intake, and replace the gaskets (they are reuse able but you should have new ones on hand in case they are damaged. The spark plugs installed in the engine are designed to last for 100k miles, unless you have a misfire, then there really no reason to replace them.
I would replace the spark plugs after 50K, the wires and plugs again at 100K.
on the 3.5 v6 take off the engine cover, unscrew the coilpacks and take out the spark plugs.
Changing spark plugs is relatively easy. Disconnect the batter and spark plug cables, and remove the old spark plugs. Next replace the spark plugs with new ones, reconnect the spark plug cables and battery.
After 105,000 miles. Nissan Maxima spark plugs are platinum-tipped and lasts for many years.
Take it to a Toyota dealership
How to change the spark plugs
get a 3/8 in.drive Rachet,w/a 10in.3/8 extension,plus your spark plug Socket.that will do it!
u take the old ones out and replace them by color
NGK platinum plugs
Both V6 engines have 6 spark plugs
yes - 8 spark plugs for a gas V8 engine