What happens if I leave my job during a SF-85P security clearance?

I need blunt advice here right now.

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I currently am getting a SF-85P security clearance for a government contract job and I'm trying to figure out if I should leave my current job because I hate it and I don't see myself going anywhere with it. I already filled out the paper work as of yesterday and I'm not sure how to update it. I have save for an apartment since its in the other side of the state. The problem is that I need to get a new job anyway because my job requires me to drive alot and its a lot of gas money and its hard to save. What should I do? I had a talk with my boss and I'm on the verge of being fired because I've been missing work the past couple of weeks. Any advice on what I should do?

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