Recently, my 6th gen V6 coupe seems to be performing below average on the highway. Doing around 60 in 4th gear (ATX), if you give it gas, it seems to take a couple seconds to actually accelerate...........its almost like "turbo-lag" on a non-turbo car.

Ive noticed that if Im parked at idle and accelerate, the engine almost seems to go down in RPM, and THEN accelerate. It only happens intermittently, but I thought it might be a clue.

Any ideas? Car has 35K miles on it (its just out of the regular warranty, and I wanted to see if I could figure this issue out myself so I dont have to fight with the extended warranty). Going to start by replacing the air filter, but after that I figured Id get everyone elses' opinions.

Thanks!!!!
-Chris