I have an LS. I love the car, but it does have some quirks. The T-Bird has the same motor and trans as far as I know. The 03 and later LS has a drive by wire throttle setup that leaves a lot to be desired. It is very slow to respond to the point that it makes it feel like a turbo with a lot of lag. The transmission shift schedule is also not the greatest. It is easily confused, and cannot pick a gear.
I know this all sounded bad, but I wanted a sporty RWD 4-door sedan as my daily driver and I do like the car in spite of the quirks. Good luck.
2018 F-250 6.7L Crew Cab 4x4
2013 Dodge Charge R/T Daily Driver/Beater - All original 208K miles and counting
Sold - 04 Marauder, Silver, Dark Interior, Factory Sunroof.
Z-Tune, JLT CAI, Z&M Control Arms, KYB Shocks, BC4E Dead Pedal, Pro Guard, Sparta Watts links, R1 Slotted Front Rotors, Braided SS Brake Lines, Automatic Traction Control "Turner-Offer".
4.10 FRPP gears awaiting install (on extended hold).