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When the EGR fails, it will cause the valve to stay in the open position.
Thats why your car idles rough.
In some cases, simply removing the intake manifold and replacing it with an aftermarket one will throw an error code and your check engine light will go on.
I've had this happen to me :/ i just dealt with it.
PS. I got crappier gas mileage afterwords too, kade auto.
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