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Rattling Noise Under Hood

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Hi, wondering if anyone could point me in the right direction for solving this problem. I have a 2003 Silverado 1500. A few days ago I started hearing a rattling noise under the hood. It's mainly when I accelerate. I also noticed that the oil gauge drops down to the quarter mark when idling and shoots up to the 3/4 mark when driving, if that has any connection with the rattling noise.


I checked my last oil change invoice (from a month ago) and it was recommended that I get the serpentine belt replaced, fuel injection service, and a coolant power flush. I looked online to see if these things might be related to the rattling noise, but it seemed iffy. Any ideas for me on what to look for under the hood? I'm not knowledgable with autos and have been burned before by mechanics. :banghead: Trying to be smarter this time around, but wow is it overwhelming.

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