It depends on if you are using the early '68 or the post-service-bulletin configuration. And that depends upon whether your distributor vacuum advance has one or two ports, and if your car was subject to the bulletin. If it has one port on the front of the vacuum canister and one on the back, you can use 5 lines. If not, you must use the three line configuration.

https://firstgenfirebird.org/dtb/docs/68-T-2.pdf
https://firstgenfirebird.org/dtb/docs/68-T-2A.pdf

If you take off the adapter plug, the ports on the TVS are marked. CA=carb advance (vacuum port); DA=distributor advance (front of vacuum canister on distributor), DR=distributor retard (back of distributor vacuum canister), CR=distributor retard. There is also a vent port.


Those are the idle mixture screws. They control how much fuel goes to your engine at idle.

Reference: http://thefirstgensite.com/library/qjrepair/qjservice1981.pdf
http://thefirstgensite.com/library/68sm/engfuel/engfuel.html

Also check the position of your accelerator pump lever, and the tension in the secondary air flap spring.




Nope, that's normal.