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Message: <blockquote data-quote="Benne02" data-source="post: 1521920" data-attributes="member: 29623">Hello! As the title suggests I'm having issues with my idle. For some reason it always gets down to about 1900rpm and then sits there for 5 to 10 seconds before moving on down to around 1000rpm. It is like this weather it's standing still or the clutch gets pressed in while driving. (It's been like this for a long time but I have not come around to look into it.) Since I installed an oil catch can and did a liqui-moly clean in the engine before my oil change (not sure if this is the cause or if it has no correlation) the RPM's on idle have been going past 1000rpm and down to around 600rpm, at this rpm the car runs very rough and backfires. Other things done to the car is a CAI, Exhaust, and SCT tune (have set idle to about 1000rpm in my tune). We are experiencing what we think is a vacuum leak since the vents for the AC won't open in the cabin, which might cause the low idle, but the vents haven't worked for a long time and this sudden drop of rpm is new. Not sure if a vacuum leak could cause rpm's to get stuck either.Any help or expertise would be very much appreciated. Thank you!(Video of idle: [MEDIA=youtube]e9naRQSs44w[/MEDIA])</blockquote>