Question about 2004 GMC Canyon

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2005 gmc canyon

I had the fuel filter replaced recently but suspect they never really changed
it. I am experiencing rpm variations while idling. Idle is rough. But runs great. Not showing the "old fashioned" bad fuel filter symptoms. Filter looks super east to replace but is it?? How are lines removed?? This is my first "modern age" vehicle. HELP!!

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Air flow metering valve

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