Are they fairly loose on the plugs? I bumped one the other night while tightening header bolts and didn't realize until I was driving a little later and had the check engine light on. Stopped and checked and the boot under the metal seemed to just slip back on. I figured it must be somewhat loose to come off that easily.
Wire boots
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When I checked the gaps on all my plugs a couple months ago never noticed any of the boots loose; well they may feel loose, but if you put them on and they make a snap sound that is the connector locking into place over the spark plug. They usually should make a pop when removed as well. Just pull all of them and push them back on to make sure they lock; otherwise you might have a bad plug wire.
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