I have a 2003 Mustang GT auto. When the car is in 3rd gear at low RPM’s (around 35-40 mph) and you start to slightly accelerate, it is a bit jumpy and sort of bucking. It’s almost like it’s trying to shift into OD, but can’t make up its mind whether or not to shift. Once it shifts into OD, it’s fine and doesn’t do it anymore. Also, under hard acceleration, it doesn’t do it. Only when you’re barely on the gas. Third gear is the only gear I’ve noticed it in. Only mods are welded in mufflers and a K&N. It’s done this ever since I got it (it has 26K miles now, 16K when I bought it). Does anybody else have this problem or know what it might be? I’ve just assumed that it was normal, but if it’s something that needs fixing, I want to get it in before the warranty goes out. Thanks!