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.
Only if there's something wrong with your old spark plugs.
Changing your spark plugs could theoretically make your car faster but not enough to make a noticeable difference. Changing your spark plugs when they are worn will increase your fuel mileage slightly.