350 carbed 91 firebird.with vac advance connected to timed vacume port car dies when i rev it.disconnect the vac advance and the car dosent die.new diaphram.whats goin on?

 

Keep an eye on the timing with a light when you blip the throttle. What happens?

 

is it possible that the engine is pulling way too much vaccum and whenever i hit the throttle its advancing it way too much.isnt there a way to adjust the manifold vaccum.

 

No, not possible.

Check to make sure your rotor tip isn't bent over to the side.

If you're using "ported" or "timed" vacuum, there shouldn't be vacuum there at idle anyway.

 

im am using timed vaccum.also when it dies it backfires if that helps any.

 

the magnetic pick up in the distributor is no good
check the wires that go to it to see if they are broken

 

well i have a junk distributor my buddy made up with spare parts.i geuss my best bet is to get a new distributor.hey is it possible to burn almost a quarter tank of gas just idiling for 30 minutes with a poorly tuned carb.its an edelbrock 1407 750 out of box.im running 350 bored 60 over vortec heads mid cam 9.5 compression.or do i have other problems,or am i just experienceing the crappy gas mileage im going to get with this setup

 

its definately got to be running rich.

When i did the break in on my motor, 30min @ 2500rpm i burnt about 1/8 tank.


BTW Edelbrock carbs arent good for anything but looks! check out the numerous threads about them on the carbs board.