I don't know much about automatics but i just replaced the bypass coolant hose and for some reason it putts when its in park... any ideas? thanks

 

i can probably answer your question, but first, which hose is the bypass coolant hose?

if that's the one on the front of the transmission like i'm assuming, did you make sure the ATF level is high enough? check the transmission dipstick and make sure the level is within the crosshatching on the dipstick.