what could be this high pitch sound coming from my car?

Gerson D

New member
I have a 98 eclipse gst with a rebuilt engine 3 months ago. 3 day ago aftr coming out of a store I heard a high pitch sound coming from my hood, so I opened it up. and the sound seems to be coming somewhere between the injectors and the throttle, but I dont know what it could be. could you guys please help me? I hope is not something big. the sound is not loud but it is a little annoying.
thanks and God bless.
 
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