Now that I've owned my Mustang for a week, I have some issues with the engine. The engine sounds rough, I don't know if its because I'm use to GM engines, but like starting it up after sitting a while, it'll start, then bog down for a second, then speed back up. It also likes to shake a lot more than I'm use to, not massive shakes, but little shakes, is it because it's RWD, and I'm only use to fwd still? Also Slowing down from say like 55, and putting it into 4th gear, it'll actually make a really loud bash noise for like a second, like a hammer hitting a metal panel, as soon as you down shift into 4th and give it gas, is that Normal? Are any of these things normal, or did I buy another POS car?