Tip - How Do I Buy A Car When I'm Upside Down On My Current Loan?

I desperately need a new car, the one that I have is becoming an unreliable money pit. The problem is I owe $4000 more than it is worth. I have no cash for a down-payment, but I can handle $350 per month. How do I get into another vehicle and break the cycle of being underwater on a car loan?
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