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.
Replace the spark plug wires, too much resistence in the old ones.
06.0 on a 4cylinder 2wd s10
40
Need to know what engine it has to answer that one.
The diagram.