Vacuum Diagram for the 4.2L
 

Does anyone know where I can get one? Search function doesn't turn up anything useful. I hear a hiss/whine noise that gets louder when I accelerate so I'm trying to troubleshoot. Lines are 10 yrs old so they're probably done. Any help is appreciated.

What year?

I seen you have a 2002...

I thought i had a diagram but i cannot find it.

Can you tell where its coming from? Do you have a aftermarket CAI?

I usually start the engine and spray carb cleaner along all the lines.. And if the idle changes where you spray.. You have found the problem..

I have it on my computer just need to figure out how to upload it....got it...lol. I got this off of the Ford repair manual (disk I purchased on Ebay) It should also be on a label under your hood too. This is for the 4.2
Attachment 503064

It's coming from behind the steering column. I notice it as I'm sitting in the truck and driving. I can't hear anything unless I accelerate.

@Kevin6829--appreciate that diagram dude. This should help me replace all the necessary lines. You rock!