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If ur current employer doesnt revoke ur 140 petition or stop GC process, it will continue. Once u pass ur 180 days, the employer cannot do anything on ur case, thats when u r safe to change employer and continue your GC. Also make sure when the 180 days is from RD or ND, most people say its RD, But INS considers our ND as their received date from th mail room to them for process. U can talk to ur attorney.