every guitar i have ever worked on or bought had many things slightly loose. do not be the guy who tightens lug nuts to 300 pounds of torque but check EVERYTHING and make sure it is snug. go with new strings that have been stretched. guitar in playing position and fret the notes the way you would normally when checking intonation. good tuner with fresh battery, electronic stuff with weak battery is wonky no matter how "good" it is.