I picked up a 78 GL1000 a few weeks ago. The bike had been sitting for a full year and the previous owner did not drain the tank or carbs. I brought it home, drained the tank, put in fresh gas with some Stabil and it fired right up and ran fine. I've ridden it a few times around town and it's been great. Today, I stopped at the store and when I came back out, the bike started right up but was running rough. The header pipes were hot from already running so I couldn't use that to determine which cylinders had dropped. It felt very sluggish for another mile or two and then it straightened out and ran fine. The bike has 36,000 miles on it. It is incredibly clean but I do think it needs some tlc to get it right. A friend suggested the issue today was dirty carbs and, while they might need to be cleaned, I kind of wonder if this is maybe an ignition issue. I am planning on cleaning and setting the points and checking the timing but what do you all suggest I do next? What should I do when the issue presents itself again so I can try to narrow this down? Thank you.