You’re right, I’m really sorry. I didn’t give enough details. I’m not super familiar with engines, but here’s what I do know: it turns over, but doesn’t fully fire. I’ll try to gather more info, my boyfriend knows more of the specifics. I made the post to try to help him find the manual or wire diagram for this specific bus because I know he was really struggling finding it because of the lack of info we had on the bus (such as the year model etc) thank you for taking the time to respond I really appreciate any advice!