http://www.supercar-engineering.com/rubberducky/3S/Maint/All/Plugs/index.html
NGK platinum plugs
how to change number 6 spark plug on a 2006 mitsubishi galant
2002 galant , can't find the spark plugs
When changing the spark plug gaps it is important to remember the gap size. The gap size for a 2003 Mitsubishi Galant 4 cyl spark plugs is 0.044 inches.
It could just be a bad spark plug wire or the spark plugs need changing.
It is important to remember the gap when changing the spark plugs of a car. For the 1987 2L Mitsubishi L200 Pick up, the gap size is .045.
Four.
Obviously- the spark plugs were not the issue :)
Six
You must remove the entire intake manifold for you to have access on the three spark plugs located underneath it. it is advisable that a qualified Mitsubishi technician should do this.
Once on 1-2 year on regular spark plugs. Once every there years on High end spark plugs.
Only if there's something wrong with your old spark plugs.