Ideas on engine stall -

[Grantkat]

1999 S70 GLT. Occasionally (3 times now over the course of approx 4 to 6 weeks) the engine will stall when I hit the brakes. I run in rush hour traffic every weekday 5 days per week

Times #1 and #2: cruising along in rush hour traffic at ~ 60 Mph and have to hit the brakes and slow down fast
Time #3 - this morning while sitting at a red light - light turns green everyone starts to accelerate (this again is a highway). I accelerate only to have the car ahead of me hit the brakes, I hit mine and it stalls. Now this is not a bury-the-nose-of-the-car type stop, more of a hard stop.

the car always starts back up, no issue.

there are 2 issues with my car I need to address - not sure either contributes or is a cause but still:

1) - i have a leak in the pipe going to the ETM i recently discovered during a smoke test which has not yet been addressed
2) - pretty sure the check valve on the fuel pump is bad. - plenty of fuel pressure, it just doesnt hold after i shut the car off

thoughts?

[abscate]

You need to have a nice tight induction path on a turbo me7 car (1999-on)

Get that snorkel leak fixed first

[jmartin919]

Check the big accordion-type pipe going to the MAF sensor. Feel all around for cracks or even take it off and bend it.

[erikv11]

Eyeball that fuel pump sometime soon. Often "failing check valve" on a P80 is actually the hose inside the assembly is coming loose. Short, submersible fuel line hose between the electric pump and the top of the assembly.

[misha]

Brake booster vacuum line or check valve?