Sound like the auto choke is the problem, when those carburetors get old and worn you’ll start to have all kinds of problems. I would just replace the carburetor with a Dellorto 14.12 with manual choke, but you’ll need to buy the intake adapter for as well due to it being a clamp style part. Good luck with it.

So I've been driving it more frequently just for it to get some use. The scoot had

Things I've done so far - Pulled the carb and sprayed A LOT of carb cleaner all over the inside. Made sure all the holes got hit. - Replaced fuel line - Installed an inline fuel filter - Pulled gas tank and washed it out with water / vinegar blend - Replaced the petcock @horsestickmpg8400 I thought about adjusting the the idle but once it's warmed up, it seems to run very similar to my other Express I'm wondering if the auto choke is the problem?

A mate had an older Tomas moped that would knock the auto choke off as soon as you throttled it - had to leave it to warm up without revving it until warm. I would replace the auto choke with a manual one.

try turning up the idle screw on the carb? it may also need a carb clean even though it looks clean on the outside the inside of the carb is probably all gummed up