Help with engine hose please.
 

Hi everyone,

I was on the interstate this afternoon on my way home from work, and I floored the gas to go around another vehicle that cut in my lane. Well my car immediately lost power and started to chug down. I got it to the emergency lane, and there was a really bad smell coming from the engine. I checked and finally saw that this hose came off. So I beat it back down with my fist and was able to get the car home. Does anyone know what hose this is and what might have happened or what might be wrong? I hope nothing too bad, I replaced a transmission 2 weeks ago. lol
Thanks in advance!

edit: its a 2001 Saab 9-3

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