I have a sbc 350 with edelbrock 1406 manual choke.
it is missing choke cam linkage..
car runs perfectly fine had it working reasonably ok with 650rpm idle .
I then swapped out stepup spring with a pink 7inhg as I was pulling 15 manifold.
also rerouted all wires to stock positions under header along edge of head. Now I cannot get engine to go lower than 1300rpm.
acts like it's fighting vacuum and does occasionally stall trying to adjust idle screws and mix screws but always does and remove drop out then high repetitive.
if I Rev then she acts 100% fine at higher idle.

Stepup springs was changed due to some broken ones or whatever got tossed in from previous owner wasn't even long enough to keep plungers up of metering rods

 

Not sure about "fighting vacuum". Or for that matter what those springs might have to do with it.

Sounds more to me like a vac line got disconnected or broken somewhere; or, something unexpected happened inside the carb when you worked on it.

I wouldn't mess with the "timing". If you haven't already dinked with it, it's right where it was when it was running perfectly fine, and all you'll accomplish by dinking with it is creating yourself one more thing you have to go back and un-screw up when you find and fix the real problem.

What happens if you set the idle screws back where they belong when it's running right (since after all you'll have to do that anyway, once you fix what's broken: the ABSOLUTE WORST THING YOU CAN EVER DO to a broken car, is start misadjusting on things), and put your hand over the air horn while it's running?

 

I didn't disconnect anything only rewired the plugs 1 at a time under header.brand new plugs and wires.
still learning more on how carbs are.
only thing using vacuum is pcv, brake booster,, and vacuum advance..
guessing I should try a smaller spring.
one thing I did notice I changed my linkage on accelerate pump to lowest which also dropped my vacuum to around 12inhg or so which showed late timing on my harbor freight Guage. Placed it back into middle hole and went right back to 15inhg
I'll try tomorrow dropping it down to 6inhg spring and see what she does

 

You could try putting it back like you thought it was, and see if it goes back to behaving.

If it doesn't, then there's a mistake somewhere.

One variable at a time. Don't mess with stuff that isn't part of whatever you did. If it worked before, and now it's messed up, then either (a) whatever "adjustments" you put on it, were WRONG. or, (b) you disturbed something else unintended, and now you need to find it and fix it and get back to "tuning".

Resist the temptation to just start dinking around with other random stuff that you don't know why you're doing that, until you find out and figure out why whatever you thought you were doing that got you into this situation, didn't work right.

 

.I can't revert the springs section fell and got lost.
They looked like homemade and only maybe 1/4in sticking out of plunger vs proper spring size.
spring caused it to basically stay in power mode always sucked in. only other thing I did was change routing and made a make Shift connections rod for the fast idle linkage. When on take fast idle it stalled until I increased idle to 1k

 

Just verified original 2as at 15 using my father in laws Guage.
switched to mine and was showing 18 but after setting the accelerate pump position it changed to 15. Not at 12.