Chords Am,F,C,G
Intro is just picking up and down once each chord.
Palm mute the verses and just strum the chorus.
Verse one

 Am           F          C             G
     Amazing Grace    how sweet   the Sound 
          Am         F          C       G  
    that saved    a wretch   like me 
       Am         F           C       G
    i once   was lost   but now   im found  
           Am         F           C       G         
     was blind    but now    i see     so clearly

Chorus 
Am       F                C               G
   Halleluja  Grace like rain      falls down on me  
Am        F                 C                      G
   Halleluja   and all my stains   are washed away are washed away  

Am    F    C    G