The warrant does not "go away". The issuing judge has probably already given your information to the authorities in the district where the warrant was issued. If it is federal, you should contact an attorney and make arrangements to turn yourself in because the US Marshals will find you. If they have to pick you up, you will find it difficult to get released on bail. Take our strong advice, you want to resolve this as soon as possible - this is the only way to get on with your life without looking over your shoulder.