Edit - looks like you have an EA81, thought it was an EA82. Should still be much the same, but which side the ports face and where your canister was and such might be a little different. theory should be the same though.
First off, check if you have an O2 sensor plugged into the exhaust at the Y where it goes to 1 pipe. if you do have an o2 sensor wired there, disregard everything anyone has told you in posts and start searching for "hitachi Feedback carb". if you dont have a sensor, keep reading.
Second, if you eliminated the charcoal canister then you probably plugged or otherwise messed up the bowl vent. you will get erratic behavior from that because the carb needs to be able to both pull air into and vent air out of that port. its one of the only thngs you actually need and it needs to be open to vent, but mine needed to be somewhat restricted to run right.
On the front there are 2 hoses that go towords the passenger side. one looks like a match to the gas dribbler on the back, just plug it. the big one on the corner is the bowl vent. this used to go to the charcoal canister, but if you took it out you need to make sure you didnt plug the hose. just open didnt run right for me, plugging it didnt run right, I tried cutting a small hole in a plug which was better, but the best for me was to cram a slightly smaller hose onto it and leave the hose long to add just a little restriction. right now mine is about 2-3 ft long runs around the carb and is plugged into the airbox.
I have everything pulled off of mine and it runs well. I average 28 mpg, starts well, drives fine, idles even when cold with no choke, doesnt smell. Im sure it could be better, but im perfectly happy with it till I can get something better worked out.
on the back driver side of the carb you will have 3 hoses going to the firewall. one is the fuel line, one is the return line, one (that actually goes to the airbox) that is a tank vent. keep both fuel lines hooked up and dont reverse them, dont plug the tank vent. tank vent can be open atmosphere or routed to the airbox or something. I did airbox so I dont get any gas smells around my compartment.
on the back side of the carb faceing the passenger side is some kind of vent that dribbles gas. i have mine plugged off and it works fine. I had it routed different places but the raw gas coming out of it just caused issues. havent had issues since it is plugged. plug it tight or you will have a gas leak.
back passenger side of the carb is a vacuum for the secondary canister and some for the choke. Disconnect the choke and plug the lines, make sure the top butterfly is fully open. if needs be give it the Camaro treatment and wire it open. once you get it running right you can reistall the choke stuff and check it, but for now just disable it so its not causing problems if its faulty. check the secondary canister to make sure there are no leaks and that it is plugged in (nipple kind of hides under the linkage).
Front of the carb should have 4 vacuum ports. 2 on the very front, one at the base in the middle, and one tucked under the linkage on the passenger side. some are ported and some arent, but use whatever is appropriate to hook up your vacuum advance, AC, or whatever other accessories you want. Plug the rest, dont worry about the valves and solenoids. dont remvoe them yet, but just mark where they go and disconnect and plug them. you can always just plug them in again if needed.
As stated above, remove the lines for the antiafterfire valve, and plug them off. also check the small vacuum line on the EGR.
Long story short you need to make sure your fuel delivery is correct, your bowl vent is adequate, and all the vacuum leaks are taken care of. then you can tune the carb and it will work, or at least show its not the problem.
Edited by djellum, 29 September 2012 - 07:29 PM.