2001 XJ weird sound

My XJ makes this , for lack of a better term, whistling sound when I let off the accelerator. This started after my engine overheated a while back. the only other issue i have is my oil pressure drops out at idle once the vehicle has warmed up. I have replaced the whole cooling system hoses and water pump, serpentine belt and the sound is still there. If anyone might have some insight on this it would be appreciated. Thanks:runaround::runaround:

Vacuum hose? It could have been damaged in the overheat.

Has the oil pressure problem started since the overheat, or have you had it awhile?

yes the pressure problem has been there since the jeep over heated and so has the weird sound.

thanks

Are you losing any coolant or oil? In an overheat sometimes the head gasket goes.

Also, check the exhaust for a leak.

How are the vacuum hoses looking?

not loosing any oil or coolant and i will have to check the vacuum hoses. I'll get back to you on that.