I sold my 1972 Caddilac Deville For $1200.Ive Received 100 now he owes me $1100. He went to another county and got the car put in his name but I've got the title and the ignition key.How Can he do that and how can I get my car or my money out of him?

Ok, why would you let him have a car without paying,

And where did he go, canada, mexico, spain?

I will assume, hope, pray, you wrote a agreement to purchase the car, you have a note or some paper work saying he owes you for the car.

You would have to "repo" the car and bring it back