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If it's tuned properly and everything is running 100% correctly, you really shouldn't have this happening. 555cc and 740cc are not very high flow rates, and definitely not too large that a high-quality injector like Nismo would have trouble with them idling, especially considering plenty of people have smooth idle with 1300cc/min and larger injectors. From what I've seen, there are a few things that cause this:
-Vacuum leaks
-Spark plugs (wrong type, gap, or poor condition)
-Electrical connectors (especially PTU, CAS, and MAF).
-K-value and Latency (Usually not an issue for Nismo injectors as their values are well known, and these problems tend to manifest slightly differently)
-Tired alternator not outputting high enough at idle It can be a tricky problem to iron out, but those are the first things I would check.
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