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280z N/A low idle issue


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So I've had my 280z for a few years now and I've been battling with it having to high of an idle (would not get below 2000rpm in neutral, bccv and egrv were blocked off when I bought it) I recently started cleaning up intake (taking off egr and other stuff and sealing them with custom made plates and gaskets) the weird thing is the thing that brought my idles down was replacing the fuel rail with one from a zx. Now the car idles at a pretty consistant 500-600rpm, which is a tad bit low. If I adjust the idle air scew it causes the engine become very stuttery... not sure what could be the issue, fuel pressure maybe; we hooked the old fuel pressure valve that was in the original fuel rail into this one.

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