Squeeky Door sound

[RHUranga]

Hello everyone this is my first time doing this so bear with me. I have a 2003 f350 6.0L and the problem i'm having is a noise that sounds like a squeeking door. The sound is coming from the engine compartment and is very interminttent somedays it makes the sound a lot and other days not at all usually the sound can be heard when i let off the fuel pedal and when i park and turn off the engine. The dealer can't seem to find the problem, has anyone dealt with tis issue thanks Bob

[Big AL]

Welcome to the Site!
I have no clue what it might be. Squeaks & rattles drive me crazy. I had a slight 'tapping' noise one time, while going down the road - whew - almost lost my mind before I finally figured it out - a piece of pine straw hanging from the cowl area. Without being there, I really can't help. But someone else may be able to share some info. Good luck .