yes. just grab the plug wire BOOT, not the wire, and pull. gently work it around in a circular motion if it's giving you trouble. you don't want to separate the wire. it will finally *snap* off the end of the spark plug, and then you can get in there and take them out. yay.
there are a lot of other things the mileage and smoke could be. you may need to have it looked at. could be 02 sensor, MAFS, etc.
Eric
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2002 Mazda Protege5
1989 S13 w/SR20DET (sold)
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