The odd terms go 

9 - 8 - 7 - 6  that follows a pattern.

The even terms go

- 7 - 6 - 5 - 3  that would follow a pattern if the 3 were a 4.

So the sequence should be

9 - 7 - 8 - 6 - 7 - 5 - 6 - 4

So the last term - 3 does not belong, it should be - 4

Edwin