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There's something getting in the cylinder that's not supposed to be there. Are all plugs fouling similarly? Likely an improper fuel mix (broken MAP sensor, O2 sensor, etc), or a leak in the intake system. Is it just one or two? Probably a cracked head gasket or worn piston rings on those cylinders. There's lots of photo tips on spark plug fouling on the web - the various colors and residues lead to clues as to what's causing it. Need to fix the cause, just changing the plugs won't work.

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Q: Why is your spark plugs always fouling out in a 2002 intrigue?
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