I have a 1983 d150 that stalls when braking. Why?

 

Does it stall if idling in neutral and you hit the brake?
In drive?
Moving or stopped?

 

stalls when moving and coming to a stop .

 

Check for a vacuum in the brake booster hose,fitting and booster itself or any other vacuum line.

 

i checked brake booster and replaced check valve. have checked vacuum too. carb is new but is missing port on front for charcoal canister so didnt hook that up. that wouldnt make it stall though would it? was wondering if distributer would do this if it was going bad . maybe timing advance? any ideas at all

 

Since you have a charcoal canister I have to ask if you have an EGR valve as this is a classic symptom of its malfunction.

 

oh yea. car slows down, engine slows down, EGR still dumping in exhaust, engine chokes out. pretty simple, never woulda thought of it

 

yes i have egr valve. i will check this out. thanks

 

changed egr same thing. could the float be set wrong?