Ford Repair: Taurus engine squeak, throttle linkage, taurus 3

Question
Hi. I have a 2001 Taurus 3.0L with 90K that just started making a squeaking/chirping noise at idle. It goes away with acceleration, and doesnt change at all when a/c is turned on/off, doesnt increase when turning the steering wheel. One of the pulleys or the belt, right (idler, water pump)? That's what I thought until I listened for the location of the chirp/squeal. It's coming from the top of the engine, near where the throttle linkage hooks into the fuel system (no where near the front of the engine). I'm 95% sure the noise isnt reflecting back there from the pulleys, but I dont know of anything near the top of the engine that would cause that noise. It isnt any more noticeable when I remove the oil fill cap(like it might be internal engine trouble). Any thoughts? Thanks for the help.  

Answer
Hello and thanks for the question...I'll try to help.
 Finding a noise in an engine bay is difficult at best. What I would suggest that you do is use a long screw drive as a stethiscope. Place the handle behind your ear and jaw bone and probe with the blade section. You might also want to remove the belt and start the engine, for a brief period to isolate the noise. While the belt is off, check ALL of the pulleys and also the condition of the belt.
Hope this helps,
Erik