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I got some rochester 660's installed on my rb25neo but it idles like ass and miss fires a lot. I'm not sure why it but I think it has something to due with the injector shape

I have an after market fuel rail and a tune it with nistune.

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You need to adjust the latency of the injectors in Nistune, only resizing the injectors isn't enough. Find the latency of the injectors in milliseconds, then times that figure by 2 and input that into Nistune.

I got some rochester 660's installed on my rb25neo but it idles like ass and miss fires a lot. I'm not sure why it but I think it has something to due with the injector shape

I have an after market fuel rail and a tune it with nistune.

No offence but why the injectors?

BTW those injectors are cheap for a reason and they are linear flow not expotential like all good turbo injectors.

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