A new dilema.....

Ok so you have all read abotu my ups and downs with my job. How it effects my relationship, my social life (I can have one!), my business, my eating habits, and my moods. I'm stressed to the max right now and I see no end in sight. As for a day off? Yeah right, maybe one a week and pretty soon it may be less then that. I am faced right now with the very real possibility that I will not be able to attend faire, OVFF, NERO or any other leisure activity until January at the earliest, and maybe not even then. That stresses me out.
On the Pro side I am getting a ton of expierence managing. The pay is excellent and the bennies are nice,(though I need to have a day off so I can GO to the DR's!).
The dilema...I got a phone call today that my old temp job was hireing...and not as a temp. They are looking for someone for their department full time with bennies. I think the salary would be comperable as well.
Ethically though I feel torn to my duty with Valvoline. I would be stretching the staff thin as it is. Abandoning people. I would be quitting. I don't want to do that. But I hate it and sooner or later that will effect my job performance. I feel like if I leave now it will be one step in front of failure...
Is it wrong for me to leave? (I know, way to be decisive.) I am assuming that I would be giving a minimum of 2 weeks notice. Honestly I prayed hard that my old job with the D/C would open up or soemthing there...this call seems like a gift from the gods! Now if it is only real and they really are asking about me to come back!
Arg! I have to wait till monday to find out!