Engine cuts out after start. 1993 Volvo 850 non turbo Topic is solved

[BigLib]

OK, apologies ahead of time about the length I don't know how to explain it. I was putting on a new intake hose and the small hose coming of the fire trap fell apart. I got a new hose and to the best of everything I can learn it's supposed to go to the nipple on the passenger side intake manifold. There is not nipple there, just a plat plate. I learned this is some kind of mod. So I put everything back together and now it starts strong, runs great for a few seconds then cuts out. What do I need to look for? My MAF is plugged back in and there is no little hose running to the fire trap because there is a plug instead of a nipple on the passenger side of the manifold.

I am not a mechanic so don't be afraid to ask me questions a dog could easily answer.

[misha]

Vacuum line from flame trap on early 850 doesn't go to pass.side of intake manifold.
It goes to the vacuum tree.

[BigLib]

Many many thanks.

[misha]

Problem is that....that little vacuum hose will not prevent the car from stay running.
You would hardly notice any difference in engine running when it's unplugged.

I would re-check intake manifold gasket.
It could be pinched during installation.