My mom has a 1994 Chrysler Concord, the tranny has been making noises and ocasionally stalls when you put it into gear, tonight my mom went to go to work tonight, it stalled no matter what position she put it into, my dad got in, revved the motor up then slammed it into gear a couple of times then, it worked fine. What could be wrong? It happened 2 times b4 in the winter but, we thought it was just the cold affecting the trans.