Just picked up an 09 model off my brother for dirt cheap. Garage queen, only has 5,000 on it. She starts and idles just fine and runs around town and nothing feels wonkey but get going down the highway and it just feels like it's topped out at 65mph and won't go any faster. Also as I'm slowing down, if I clutch or shift to neutral, the rpms hover around 3,000 until I come to a stop and then drop to normal idle rpms. I have no idea where to start as I'm not too familiar with these things. Thanks in advance.