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That sound like a fuel problem may be the fuel pressure regulater is bleeding down.
"As for the EGR, the sound is like a diaphram is vibrating or something. Heck, I could record it for you. : ) The sound went away for a about month after they replaced the first EGR. Then came back identical to as it was before. Again, it is only while the AC compressor is engaged and in park or neutral. If I change the RPM either by pressing the gas pedal, or putting it in gear it goes away...and then immediatly returns when I let off the gas or put it back in park or neutral. More annoying than anything"
Still doesn't make sense to be that may just have been coincedence. The EGR works in the way that there is a solenoid that controls a pin that moves in and out. Its not like the EGR valves years ago that are vacum operated and they do have a diaghram. Sorry not much help its hard to diagnose noises without actually being there to hear it.
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