Slightly less than what the manual says--I think .8 mm?

What kind of miss are you getting? Is the CEL on? Have you done a live scan to see what cylinders are misfiring?

Probably a coil pack vs. a plug has gone bad. Have you replaced all your coil packs yet?

 

Purchased all new coil packs too. Going to install them both at the same time. Car has about 35k miles on it so it's wont hurt to change the plugs too.

The CEL is not on and I had cylinder 4 or 6's coil pack replaced about 6 months ago. The CEL wasn't on that time either, I just noticed a sluggish car when 70mph+ floored on the highway. The more I look into replacing the plugs for this car, the more I'm thinking I may hold off--looks like a real pain.

 

Also, everything I'm reading is a 1.0-1.1mm gap, they appear to be gapped at right about 1.1. I didn't see anything in the manual, will have to check again.

 

Somebody else will chime in here I'm sure.

I'd just go to a dealer or garage. Give them your plugs and CP's. Labor is about an hour and let them mess with. You've already spent at least $350--money well spent!

 

Turbo x might be different, but V6 engine in 2008 manual says the gap can be between 0.9 and 1.0 mm.

I was going to take out one of my plugs yesterday to look at the brand/gap (they were replaced just before I got the car, about 5000 miles ago).

I wasn't sure how to unplug the coil pack since it doesn't have enough slack to not unplug the electrical connector. What's the secret?

 

I gap mine at 0.8 but I'm tuned. Smaller gap will help the coil's out.

 

This helped mine out tremendously. I had a miss under load and new plugs with the tighter gap fixed that.

 

I just checked and re-gapped the plugs in my TX....much smoother on initial pickup and revs out far better.
It was a lot easier to get at the plugs than i expected but very glad I have a good 1/4" and 3/8" socket set.
Any with the right tools can easily do their own plug changes.