so I have a 3.0 v6 2001 ranger edge, and it runs perfectly and haven't had any problems with it but there is this really loud whistling noise coming from the engine but I can't spot any cracks or damaged hoses..?. it's idling really rough too so I am assuming it's a vacuum leak....
Also I was going to do a tuneup on my truck like cleaning the maf
sensor and iac
but on the iac
it says " Do not clean throttle body or IAC
because it has a special coating on it" . what does this mean, I'm assuming I shouldn't clean it then..? Or does the throttle body cleaner not damage the special coating..?
thanks for your help.