bad fuel

Rough idle could be a couple of different things. 1. Bad gas. 2. Dirty carb. 3. Coil going bad. 4. Sticking valves. You're going to have to do some troubleshooting to figure it out. I would start by changing the fuel and rebuilding the carb.
 
Need to see if your gas has water in it I store just got busted in Atlanta there high dollar gas was 90% water

(( racing is the only sport that you need two balls ))
 
I usually start with the simple easy no brainer things like good fuel, good spk plgs, and a new air filter. A dirty air filter will change your air to fuel ratio to too rich almost like having the choke partially in the "on" position
 
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