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NGK, AC Delco, Motorcraft.....every well known manufacturer makes good plugs. don't believe the hype that are $5 plugs. You are just paying for someone eles's ferrari.
How do I know when I need to replace my plugs? I've had the car since August '02 and I haven't touched the ingition system. What about injectors, do they need replacement? I know nothing about this subject if that isn't already horribly obvious.