The Flash 8x09 Promo "Phantoms" (HD) Season 8 Episode 9 Promo
Trivia
When Chester says "flame's on", it could a reference to when the Human Torch from Marvel comics says "flame on".
The scene where Chester was thinking that he's talking to his father in which it was the Black Flame in disguise trying to manipulate him is quite similar to what happened in the episodes "The Present" and "The Wrath of Savitar" in which both Cisco and Wally had hallucinate their lost love ones like Cisco's brother Dante Ramon and Wally's mother Francine West in which it was Savitar in disguise trying to manipulate and torture them into freeing him.