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Message: <blockquote data-quote="Terrorist 5.0" data-source="post: 1578213" data-attributes="member: 30689">Well typically a vacuum leak results in a higher idle that fluctuates. not a lower one. Smoke test the car. That will find your leak if there is one. Check for codes as well. Always check for codes.EGR deletes are not really possible on these without a tune. You will get a check engine light. No simulator plugs for the SN’s that work, that’s a primitive Foxbody thing. If it is working fine, just leave it. It helps out gas mileage. I had mine blocked off with a piece of soda can because the valve was stuck open and the replacement one didn’t fit.</blockquote>