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Recently bought an R34 Non turbo and slowly going through the small issues with the car, but I am interested if anyone can help with this one..

The idle has been about 1.2-1.3k RPM (extremely high) and I had a look for any adjustments that can be made and turned the idle screw and managed to get it close to about 950-1000RPM but this is still not where it should be (recommends 650RPM from nissan) 

The car is a factory auto, manual swapped. Can anyone throw some ideas?

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and what if vacuum leak isn't the culprit? or is there any certain hard to find problem areas that cause vacuum leaks?

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Also possible that your tacho is out of calibration - I know mine says it idles at 2500rpm, but it's actually idling at 1000rpm. If you apply a correction in the ECU, then you can make it accurate at idle but takes it out in higher RPM. So I just left it.

 

Other than that, it's likely a vacuum leak. Find someone in your area with a smoke tester and do a smoke test - virtually guaranteed to find something leaking. 

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