my q-jet acts like this when it is dirty and the power piston sticks in the down position. it floods when it sticks in the up position.

a good soak in carb cleaner fixes it. the crap fuel today has had me rebuild a lot of carbs for people this past yr.

did you open the carb or the 2nd carb to see if any charcoal got sucked up in it from the charcoal canister?

did you set the airgap on the reluctor/pick-up with a brass feeler gauge? is it the right gap?

are you sure the vac advance or mech weights in the dist are not stuck or have a broke spring?

is it advancing when reved up?

when it is at idle does the timeing mark float around with a light on it?

are you sure you did not cross any of the wires? thats ez to do and will run almost right but stumble like this.

are you sure you did not move the plug wire 1 term on the cap throwing it off?

this is where and why I have striped all of mine before I have this issues or when I have these issues.

I prefer the 85 harness for this and have swaped an 85 harness into a few 88-93 truck when converting to carb for a clean hack job.