I have had the exact same thing for a while now and it drive me crazy at times. Planning in the coming weeks to do some upgrades with fuel pump, injectors and new GTR spark plugs plus changing from Uprev to ECUtek for a custom tune. I have been thinking the same in terms possibly the car needing a new tune to solve the problem. It might take me about 3 weeks but i should let you know if the tune was the problem.
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