G20 Infiniti? my car keeps stalling in the winter i was told i needed a new catalytic thought the mechanic was trying to rip me off replaced a few wires, and something else it seemed to help now its all the time, found new mechanic who was recommend to me and he said its a tranny problem. someone on here said it may be the catalytic problem getting it checked at place #1 and 2 today and tomorrow but how much is too much? 1999 infiniti g20 with less then 86k Miles on it