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When you open your sunroof its sucking air from the car out, which in turn sucks air from places in the car that are not air tight, thats why the smell got worse. If I were to guess I would say its something to do with the fuel pump. The reason being is when you open the sunroof its making the air from the back of the car come up front. I would check your fuel pump/return lines ect.
CRAIG
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