My 1999 tl keeps stalling while I'm in motion I know my trams is going out but is the stalling a result of tranny problems or a separate issue??

 

Shit happens when your tranny is about to go out.
I am 90% sure it stalls because of that.

When mine went out it would jerk at stops randomly. Eventually the car would stall and at that point the car needed to be towed to a shop.