Johnny:
I will assume you know how to ride, and are not leaving the bike in gear when you come to a stop sign.
The low speed jet is probably dirty.
In reality, if you have not had the bike running in a while or you just purchased the sled, there are a bunch of small problems that will add up to one big head ache.
Take the bike to local shop and spend around $300.
Bike will run like new, or should I say a 1978 Sportster.
Now go drink a beer and leave the repairs to someone else.