I just got this on trade and when i go into reverse, it stalls out most of the time. But then when I turn it back on, it goes right into reverse@@! I dont get it? Or it will bog down like its going to stall but revs back up and its fine. And once or twice i came to a light and had to come to a fast stop and it stalled out. Can someone tell me whats going on???? Can it be the trans? IAC? The T-Converter?