so today i was over by my buddes house today he was having problems with his truck missing so he sprayed the plugs and they arked so i sprayed mine to and it arked around the cap then i shined on the plugs after i sprayed them and 2 of them were bubbleling so i shut it of pulled the plugs and them were white put them back in checked them all they were fine i was haveing a miss around 30-40 mph, so what i and trying to get at is why are those plugs lose they where tight when i put them in

 

any body got any ideas

 

Taper seat plugs rely on friction to keep them in place. Some people put oil or anti-sieze on the plugs, and wonder why they loosen up over time. Sometime oil is there by accident; flows down from the rocker covers, or from the cylinders of a tired engine.

Next time, try wiping off the seat area of plug and head with solvent to remove oil, and torque the plugs properly.

The converse to your problem is people that have dry plug and head seats, but overtorque the plugs, and cannot remove them!