If your not a hands on guy:
If you were close I would love to mess around with it.
. Looks like you might need another "opinion". Or you can find an "old school" mechanic. In the US, some auto mechanic schools barely touch on, or don't teach carbs at all. You need yourself an old "classic car" mechanic to play around with your car. In the USA there is lots of them here on Craigslist that would tune a carb for a 20 pack of beer and 50$. You might also want to bite the bullet and take it to a Mitsubishi dealership.
Conversely, if you like to get dirty:
How is the compression? Go through the vacuum diagrams and rehookup everything correctly(over here its haynes/chilton/mitchel manuals, or the factory service manual for your car have these diagrams). After you connect everything up right, You can do more troubleshooting by looking up a toyota "22re" carb issues on Google (small japanese carbs are all similar). The 22re carb'd engine is really popular, and they might give you some good ideas about your issue.