I'm not sure if its just me but I have 65000 on my 06 gt and I floored it a couple times the last week and it feels sluggish. Related to spark plugs maybe?
Thats a good method. i wish i had tried that...I replaced mine at about 55000 and they were worn so they had a pretty big gap.
Ran the engine to warm it then took my time. At the beginning of each one I worked them back and fourth.
They would turn out about an 8th then felt tight so it turned then back, then loosen again they would go about a 1/4 turn. Each time they would go a little farther. Took a long time but they all came out and not one broke.