Has almost 93,000 miles. I've gotten used to the slight lag before the speed kicks in after flooring it, but this feels like something different. It doesn't always feel like the gears are smoothly engaging when I'm flooring it. Today, it felt like I was in neutral revving for a second before the lower gear harshly kicked in. Hopefully my trans isn't going!

2 Things.
1- reset computer
Check out this link :

https://acurazine.com/forums/third-generation-tl-2004-2008-93/resetting-ecu-makes-me-happy-747662/

2- And ive done this and didnt change lag but felt so much speed i didnt think my tl was this fast.

Clean air intake throttle.

Try these steps. could be a simple fix

Hope this help

Also check pressure switch