spark plugs are used to ignite the fuel-air mixture in a petrol/gasoline engine.

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How do I know when to change my spark plug

I ride a Piaggio scooter with a single cylinder engine. Recently I broke down and the engine wouldn't restart. It turned out the spark plug was stuffed. How can I ensure that doesn't happen again?
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Spark Plugs 1998 Buick Lesabre

Where are the spark plugs in a 1998 Buick Lesabre? Pictures would be helpful as I'm a novice at this type of thing. I'm assuming I need all six because I'm getting a check engine light saying number 6 ...
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Coil Pack Location

Where are the coilpacks located in a 1998 Buick LeSabre? Images would be most appreciated. Robert