Went to check some things out to see what tools ill need to remove and clean the TB. I wound up seeing this piece of metal (tape ish) hanging off the intake tube. It was originally on there kind of when I bought the truck, now it was flapping away. Looks like some sort of sensor would go here, but it is plugged off.

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while I was there i did look at the throttle body, had to take the intake tube off because i have to patch that hole. I'll wind up using heavy duty electric tape most likely. that's another story. Wiped off the TB from the outside a bit, drove home and the whistle was slightly less, however it is still there. Maybe when I get in there and clean the entire thing it will finally go away, but please keep the ideas coming in case that doesnt help.

 

I have a very similar issue i always thought it was my aftermarket intake but now i think about it i may not be. I just changed my rotors pads and calipers so its not my brakes. but did you ever figure out the problem? I would like to know as well.

 

Nope still absolutely clueless. Whatever it is, it'll break one of thes days...

In all seriousness I literally have no clue. Cleaned TB a little -- nothing.

Gonna replace brakes soon cause they're starting to pop and maybe shocks. If that's gonna help or not, we shall see.