Hi, had a similar problem when I bought my R32 GTR. Both AFMs and coils were causing the problem. Opened up each AFM and resoldered the 4 connections, then used silicone on each coil pack to make sure they weren't arcing. Oh yeah, get copper spark plugs and gap them to 0.8.
The AFMs were causing it to run like absolute crap with no power, cutting out, etc. The coils/plugs were just a slight misfire.
Cheers,
Matt