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My r33 S2 RB25DET has a rough idle after about 10 mins of driving when warmed up. It goes from like 200 RPM to 1000 RPM and some times stalls 

Ive tried to fix it by cleaning the AFM buying new coil packs and spark plugs. 

Car is stock apart from pod filter and front mount inter cooler 

also have a boost leak getting about 4psI could this be linked to the idle by any chance 

Edited by Big baz
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Glad you added the last line.

You need to find and fix the vacuum leak before worrying about the idle, the amount of air that makes it to the engine vs what the AFM thinks it is getting right at the start of the intake is critical to everything

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