Especially if the leak is in the booster. Smoke test uses pressure and check valve at booster will block the smoke.

Push your brake before you start the car after sitting a long time even overnight usually will be enough vacuum the pedal is soft.

If you have a firm pedal suggests a leak in booster or the check valve is shot.

Booster leak is a classic diagnostic miss.

If car stalls when going from 5-0 mph it's always been the cam sensor on the cars I've maintained.

I don't usually see stall related to vacuum leak. I usually see plenty of errors if there's a leak or misfire from injectors or plugs.

You mentioned replacing CPS but did you use OEM or better? The engine is really particular on that sensor. New ≠ fixed. Follow the symptoms.


–awr–

Using Tapatalk VIP on iPhone

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)