Here is a diagram of the firing order:
```
|----|----|----|----|----|----|----|
| 1 | 8 | 4 | 3 | 6 | 5 | 7 | 2 |
|----|----|----|----|----|----|----|
```
The firing order is important because it ensures that the pistons fire in the correct sequence, which is necessary for the engine to run smoothly. If the firing order is incorrect, it can cause the engine to misfire or run poorly.