Crazy idle and AFR fluctuations, no cel

[Dave9878]

Hey all, today when I started my car I began having insane idle fluctuations. It’d dip to 600 then surge to 900 and go back and forth. My afr and vacuum gauge also moved with the fluctuations. I am curious if anyone has had this issue. I’m thinking it’s the evap purge valve. I have no cel, then if it is the evap purge valve, where is it’s location on the 2018 GTs? I know the 15-17 has it above the throttle body. Thanks.

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[Dave9878]

Hey all, today when I started my car I began having insane idle fluctuations. It’d dip to 600 then surge to 900 and go back and forth. My afr and vacuum gauge also moved with the fluctuations. I am curious if anyone has had this issue. I’m thinking it’s the evap purge valve. I have no cel, then if it is the evap purge valve, where is it’s location on the 2018 GTs? I know the 15-17 has it above the throttle body. Thanks.

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[Diocletian]

Definitely a vacuum leak. Check near the airbox and all hoses. I uploaded a pic I found that should help a little

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