srjs28

I started my truck the other morning just fine, locked the doors via keypad and went back inside. Came out 5 min later it the engine was off. Tried to restart turned the key and nothing. I noticed when the ignition is on the egr vaccum valve was continuosly running, it has never made that noise before. I removed it and it seems to be operating fine just wont shut off. Also the anti theft device light on dash blinks 3 times then stays continuosly lit leadimg me to believe thete is a problem. Any ideas? Thanks Joe