73' Gmc Pickup W/ 350 Vac Lines?

[Hackkiller]

OKay:

Engine is Four Barrel 350

-It wont idle when warming up, i have to keep foot on gas because i think the choke is not working.

-It will run and idle okay after fully being warmed up.

Pictures:

-In the first picture i have no idea what that nipple connects to, so basically right now its just been sitting open to the outside air.

-Second picture the hose runs from the back side of the carb from one nipple to the other, and im not sure why? ( both nipples are right next to eachother on the backside of the carb)

ANy input would be greatly appreciated! THanks,

- Calvin

[Hackkiller]

also the it seems to be runnin just like a 2 barrel (no big kick or sound when i gas it)

[bobcat5544]

The two rear are emission vacuum ports and the one in front I believe is also an emission vacuum port. If your truck is a california emissions vehicle then those ports were used. All of the ports should be blocked off if they are not being used. If you block off the port in front that should help kickin the secondaries since secondariers are vacuum operated.

 

Note: I'm going off an 1982 350, but there should not be much differance.