R32 With Rb25de Neo (r34)

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drove a r32 with a rb25de installed (engine and gearbox from a r34).

pulling from low revs in 2nd gear, engine would rev normally up to about 2.5k rpm then the engine would stop revving

throttle is wide open and nothing - almost like im coasting.

then suddenly the engine will pick up again and rev out like normal.

when driving normally (shifting from decent revs in first into second) even through the 2.5-3k mark, there is no problems.

the guy im buying the car off says its something to do with the fact that the car is still running an auto differential or something to that effect.

is this something i should be concerned about?

install and engine and gearbox looks clean apart from this issue.

i am thinking of buying the car tomorrow evening so please any responses would be appreciated.

thanks

[Moodles2]

Could be a problem with the MAF

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it is running a pink sticker rb20det maf.

what colour sticker should a r32 rb25de have?

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car has the proper MAF. this problem cropped up again yesterday, feels like a boost cut... but this car is n/a?