By your profile... year model 2000. Looks like you might have the 2 piece plug? I have 2003 and it takes a regular one piece spark plug but still is known for spitting plugs out, because of very few threads. And not much psi to torque. While I've never had any problems with plugs and over 109,000 miles. (Sure does like coil over plugs though) I've often thought to keep plug from backing out by using some type of removable high temp (glue, thread sealer etc) something that has about 30 psi strength as if I recall right plug torque on mine is 12 or 15? Trying to see what temps the plug threads get to is another project all by itself. But thanks for posting, you've "sparked" (yes a play on words) my interest of trying to figure out a "fix". I hate be being broken down.
