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so in second and third if you get it up to baout 4700 4800 rpm it starts to go from the ususal brrrrrr to bdrbdrbdbrbdbrbdbr kind of sounds al lose acceleration and just pretty much peak

what could be the cause. ask if more info is needed

its a 1994 r33 rb25det

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Once your airflow reaches a set level as measured by the Air Flow Meter it will richen your fuel map and retard the timing to protect the motor. This is assuming you have the stock ECU of course

And while the coil packs mat be new the loom probably isnt.

I would

1. Change plugs.

2. Clean the contacts in the coil packs between the pug and the coil pack AND coil pack and loom

3. Use the contact cleaner on your AFM element

If the problem persists turn your boost down until it stops, you are effectively reducing your airflow below the threshold doing this.

if it still persists think of ordering a new loom from nissan

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