look in owners manual it will tell you if you dont have one look at the emission sticker under the hood
Click the link.
Spark plug gap chevy ls blazer
.60
.60
the gap is 0.060 inches
You need a 5/8" spark plug socket.
Follow the spark plug wires, they will lead you right to them.
06.0 on a 4cylinder 2wd s10
Replace the spark plug wires, too much resistence in the old ones.
.035
40
.40 gap