Hello,
This could be a problem with a vacuum leak in the EVAP system. An intake/vacuum leak is defined as any air entering the air intake system after the Mass Air Flow sensor[MAF] up to the engine's combustion chamber. This includes the air intake tract, throttle body, intake manifold, vacuum and EVAP lines. In the diagrams down below I have included the EVAP and emission hose routing diagrams for your vehicle for you. Please inspect the EVAP lines for any loose, cracked, dry rotted, or damaged lines and components and get back to us with what you are able to find out. Also, here is a link to a generic guide explaining how to find vacuum leaks which might be helpful as well:
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
Thanks,
Alex
2CarPros
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Monday, June 28th, 2021 AT 8:01 PM