I agree with the guy above me, main relay is most likely the cause, I don't have an automatic but I know that whole "my car will start sometimes, and sometimes it won't" so then you sit there maybe smoke a cig or something and then try it again and???huh!?!? it started, yeah this really will happen a lot if its really hot outside or if you drove the car for a little while and then stopped and maybe ten mins later you go to try to start it and nope not happening. I would have that checked that is my guess on you guys problem, not to mention its a hell of a lot cheaper than all those tranny parts and it can be tested so do yourself a favor the next time you get it started go to the dealership and say heres my key, I think my main relay is going out and explain to them exactly what your car is doing. goodluck