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Re: Removing sparkplugs
Twist the boot until it rotates on the plug, then pull straight off. Pull by the plug only, not the wire! When reconnecting the wire, apply generous amounts of silicone grease inside the boot to prevent sticking next time. The metal cylinder you speak of is a shield around the plug to protect it from heat.
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2010 Mazda CX-7 2.5L 12000 miles
2003 Chevy S10 Extreme 4.3L 57000 miles
1995 Buick Lesabre Custom 86000 miles RIP
2002 Pontiac Sunfire SE 130000 miles RIP
1997 Pontiac Bonneville SE 91106 miles Totaled by attempt to steal the car!!   
R.I.P. 1978 Ford Fairmont 83000 miles 
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