A suspect is in custody in a Sunday afternoon shooting on Litchfield's East Side. A 47-year-old man was struck by multiple gunshots just before 2:40 p.m. in the 1100 block of North Locust. In a moment of good fortune, a Gillespie ambulance was passing through the area at the time of the incident and officers on-scene flagged the ambulance to the scene and they provided assistance to the victim. Minutes later, the victim was transported to airlifted to an area hospital.    A search wantant was issued for the residence of a possible suspect in the shooting, 46-year-old Justin Adkins of Litchfield. Authorities say they recovered several pieces of evidence of value to the case. After the initial investigation, an arrest warrant was issued for Adkins on charges of Attempted First Degree Murder and Aggravated Battery with a Firearm.   He was located in Litchfield just before 1 p.m. today (Monday) and was taken into custody.   He's being held at the Montgomery County Jail.   The Montgomery County Sheriff's Office, Montgomery County State's Attorney's Office, Illinois State Police, South Central Illinois Drug Task Force and the U.S. Marshal service assisted the Litchfield Police Department in this investigation. There's no further word on the victim's condition.