Duders..
You've got a throttle that doesn't work right. Fix that. Go through it and find what's hanging up or isn't attached or isn't attached correctly.
You've got an ignition problem on cylinder 4. Find out why. It's spark, fuel or air.
You are running rich. Find out why. Improper use of choke? Jets correct? Etc.
You need to go through each system one at a time, from start to finish.