1995 VR6 OBD1

Hesitation when cold on acceleration. Starts and idles fine. Upon hard acceleration there is hesitation or flat spot for 2-3 seconds. It then revs. Upon quick release of the throttle the engine will stall, or stop firing on a cylinder or more and sound like a wrx.
Seems to go alright when its warm.


Throttle body - spotless
Coilpack - no visible cracks or any arcing in the dark
Maf - cleaned
Fuel pressure - 45-50psi, upon removal of vacuum pipe from regulator, pressure increases.
Vacuum pipes leak free
ECU - Nice and clean

On computer diagnostic.
No errors relating to engine.
Temp sensor working correctly.


Also, on air con, pressure guages both low (regas pressure guages). Compressor??