Off boost misfire/hesitation/sputtering when hot at cruising speeds/partial throttle

[nismo-152]

Hmm, wish that was the case however I have deleted the narrowband O2 sensors and adjusted my power fc to not reference them (car is tuned for no narrowband O2's).
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Are you running open or closed loop from your wide band o2?

[dylanc]

Massive vacuum leak found, melted vacuum cap was leaking lol
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[SkylineUSA]

Well, that is good to know! Thanks for the update. Still cannot understand why under full boost there were no issues.

[dylanc]

Full boost performance is loads better now, spools quicker and harder, and has leaned out a tad, so it was effecting full boost condition but was gradual so I forgot how it used to pull!
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