Metal part fell off in the engine compartment?

Hello together, maybe you can help me. I just drove on a very steep driveway and almost strangled the engine. But I gave a little bit more gas just before choking off again and then drove off quite normally without finally strangling it. Anyway, at the moment I almost choked it off or shortly afterwards a metal noise from the engine room. One heard something fall down and several times biting metal parts. I looked immediately on the road, but there was nothing there. I then of course looked in the engine room, but found nothing. Finally I cut from below against the splash protection and/or the engine cover to hear if there might be something lying there and jumps/klappert – nothing. I then drove further, after about 1 km in a slight curve I heard then again like something in the engine room clapping, after that the noise was gone. I think there I lost the part. Could the sound d The car doesn’t drive an error message or anything like always. Someone’s idea what that might have been or where I might be looking for a missing part? Thank you very much!