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...difficult is this?

 
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Not hard.















If you are going to change the plugs and wires and you haven't done it before the easiest way is one at the time.















That way you don't get your plugwires crossed up.















You make sure that way you route the wires the same way you took them off.















Make sure the plugs are gapped to the specs. Probably shown on a tag under the hood.















Blow out the dirt around each plug on the head before you remove it.















Then when placing the new plug in don't try to force it into the threads.















Once you get it started it will go in fairly easy. Tighten but don't try to break it.















Then just connect the plug wire.















Push til you feel it snap into place.















Remember just do them one a the time and take your time.

 
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its not, go to ur auto shop store buy spark plug that match ur car-there in the owners maneuel (make sure the space is matched too.). get those and take a wrech and unscrew the plugs and the then screww those in. they are located on the side of ur engine,( depending if its 4 wheel or not). BUT make sure the wire that u toke off the old plug gose in the new plug and in that same hole.