It seems everytime i drive my car for more than about 20 mins it starts to slip out of gear when cruising. It doesnt do it in any other gear than 4th and it only does it when the a/c is on. When is slips out of gear if you tap the brake it goes back into gear. This seems like a converter problem but it is really okward so i thought i would get a second opinon. Really do need help about to go to school and car has to be perfect.

 

ttt i really need help cnat drive with out a/c in texas