I drive a 2019 10 speed auto eco boost and noticed this weird knocking like noise after the car is at operating temp. The knock is not consistent and doesn't get worse as I accelerate you only hear it at the very end when the rpms settle it goes away I was told it was the vacuum pump but would like to get other opinions as well. no knock counts at all everything seems to look okay on the logs. No power loss runs great I just hear that weird noise on the ass end of the rpm right before it hits idle. thanks in advanced.