E30 power loss/surge on accel and steady throttle

[Rob's E30]

Usully runs great cooler outside temps.During and after warm up,engine surges and power sags under moderate and full throttle.

Vacumn gauge actually gains .2 or.3 during surge-All fuel related components are BMW new-tank,pumps,injectors,regulator,hoses-etc

Cleaned ICV,conditioned changed,but now idle hunts 1100 to 2000 rpm.s.

Can the ICV cause manifold vacum fluctuation even off idle,this may explain my issue.

Looking for input-Thx

1986 325es 2.7 5spd