What expenses am I liable for if I want to back out of a real estate purchase?

Question Details: I signed a contract and put down earnest money of $1,000 for a home. The seller agreedand I paid for a home inspection; there were 13 items on the list that needed to be repaired but I asked the seller to repair only 4. They did. I have since decided that I don't want the house. They refuse to sign the mutual agreement unless I give them an additional $1600. I am not willing to do that. I thought until the day of closing that the only money I could lose would be the earnest money, the cost of the home inspection and then the appraisal. They are threatening to sue me and force me to buy their home. Can they do that?

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