04 cobra unknown engine noise

[50GTMach1]

[video]https://youtu.be/D-LikkRw5DU[/video]

Changed throw out bearing started cat and heard this. Noise sounds like its coming from the intake.
No idea what this is. Happens at engine shut down. Replaced pcv valve as in read that might be it but the noise persists. Anyone have any ideas? Thanks in advance

 

[toomanytoys]

Do these cars have a fuel vapor reclaiming system? My Expedition makes a noise similar to that after shutdown. Never heard my cobra do that though

 

[50GTMach1]

Do these cars have a fuel vapor reclaiming system? My Expedition makes a noise similar to that after shutdown. Never heard my cobra do that though

Thanks. Ill research that.