Guys changing spark plugs does not going to improve your fuel economy nor give you any performance boost,etc.its just give your engine a stable efficient combustion by providing high quality spark,that is all.You just need to follow the spark plugs changing interval,in the case with 2008 Infiniti G35 its 105000 miles.Denso iridium long life the best choice.

 

great write up, definitely will do my very soon!!! thanks

 

awesome step by step thanks man

 

I'm due for this, gonna do a plenum spacer while I'm in there..

 

Here it is in a pdf format so you can print it out and have it with you under the hood.

 

Would a 5/8" spark plug socket fit? it's the magnetic kind, so if it is 0.125 mm to large, would that still work?

 

Yes.

 

for the wires on spark plug 4 and 6 do they cross? also i did a spark plug change on mine and i used these spark plugs from auto-zone i put everything back together and i had bad idle the rpms would drop and the car will die do you have a clue what i did? also my ignition coils dont seal they seem to keep popping up?