When I'm driving at highway speeds I get an on and off high pitch whistle noise. It almost sounds like a turbo spooling but unfortunately my truck is n/a. The noise gets louder and quieter as I push or let off the gas. It just started happening last week and it doesn't happen all the time.

Any ideas?

 

Gasket under the air hat.

 

Can be bought at the parts stores for about $2 or so

 

That's brand new

 

So you have an intact air hat gasket? If so, any vacuum leaks?

 

Gasket intact. Yes. No vacuum leaks. Like I said its intermittent as I'm driving.

 

Check and make sure the filter housing is seated correctly, they can be kinda fun to get on there right.

 

Just checked and its on tight

 

Will it make the noise in the driveway, in park?

 

No. It's only does it for 3 or 4 seconds at a time when I'm going 60 then it stops. When I'm going 70-75 it is louder and does it longer (10-15 seconds) but is still on and off