20v blacktop swap bogging

[znull]

Hi guys, I have a ae86 hatch and recently did a 20v blacktop swap. All good with the swap, I have a distributor relocation kit (SAM). The engine is running perfect at idle, runs incredible on WOT, but if I slowly rev it, when it get's past 3500rpm it starts to hesitate and sometimes misfires. Even if I try to keep it constantly at 4000rpm for example it boggs... I checked all the sensors, sta wire, timing, everything is at it's place... new O2 sensor, coil, spark plugs, rotor... No CEL codes what so ever. I can't seem to sort this one out. I've been killing the internet theese last few days but nothing works. Maybe someone has an ideea and is willing to help me. Cheers guys.