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Experimenting last night, there is about 100 RPM drop (estimating between 900RPM in neutral/park and 800RPM in Drive) and yes the A/C makes it worse... so much that I tend to turn the A/C off when stopped in traffic.
If it is a vacuum leak wouldn't the rough idle be persistent and continue even when in park/neutral?
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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