煽る is a godan verb, consistent with your example conjugations (if it was ichidan it would be 煽た、煽たい, etc)

I used to get these terms mixed up all the time because some textbooks use "Group 1" and "Group 2" to refer to these verbs, but Group 1 doesn't mean ichidan.

For all that I'm not totally sold on this article's idea of "stems" and "suffixes", I think it does a good job of avoiding this pitfall and correctly explaining the groups.