I would have a complete inspection of the entire underbody of that vehicle......I don't think it is worth it to invest $1000 in this....
I remember a woman coming into the shop, for a lower intake job, and complete tuneup......when the car was in the air, I noticed the underside as I was walking by......I told the SM that she should save here money, and use it towards another vehicle.......she said she couldn't afford one....I told her, it looks like her brake lines, fuel lines, were ready to go....and the underbody was rusted pretty bad......salesmen were more than happy to sell here a car, but they wouldn't give here anything for her old one, because of it's condition.....she'd rather spend $800, then have a bank payment each month......
One month later, her car was towed in....the top of her left front stut, pushed her front hood up....money wasted...
Go to Kelly Bluebook, and put in condition, options and mileage....I think you will find that the car may not even be worth $1000.....you are throwing money away.....