I bought a 2007 Kia Optima a little over 24 hours ago. It's a great car for the price. I got the EX 2.7 V6. The only thing I've noticed...and it's really not that big of a deal...is that when I let up on the gas it seems the front end of the car wants to dip down. Has anyone else noticed this? And if so...do you have any idea why it has that reaction?