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Spark plug setting should be at .31
0.031 thousandths with spark plug gap tool or just plain 31 as I go by.
.31 to .36
.28 to. 31
.24 to .31
31 gap according to my 1991 corolla manual.32 or 31
between .28 - .31"
.31 to.35 by service manual
ngk plugs are .31 to .35
0.031 thousandths or just 31 plain and simple using a gap tool.
0.31-0.36
.28 to .31