So I bought a 91 CRX with a DOHC ZC motor already swapped in it vehicle ran ok had slight hesitation when accelerating at low RPMs. Drive vehicle home and around town for about a week and master cylinder went out I replaced the master cylinder and decided to do a brake booster delete vehicle starts and runs fine but has a idle surge or hunting idle when I start slowing down and press in the clutch. When I stop the surge goes away. One other issue is if I plug the spot where the brake booster vacuum hose was normally hooked up at on the back of the intake manifold the vehicle shuts off. Does anyone have any ideas as to what’s going on? I have replaced the IACV and bleed the coolant it is fine. Throttle position sensor is set and within the .5v when sitting and 4.5v at wide open throttle ranges it should be at. Any help welcome and appreciated thanks in advance.