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What is the firing order for a 1989 Chevy S-10 2.5L 4 cylinder?

The firing order for a 1989 Chevy S-10 2.5L 4 cylinder engine is 1-3-4-2.

This means that the spark plugs fire in the following order:

* Cylinder 1

* Cylinder 3

* Cylinder 4

* Cylinder 2

This firing order is standard for most 4-cylinder engines of that era.