engine idles ok, cuts out and bogs down when accelerating
I have a '94 vulcan with about 25K miles. The bike has been running great with a couple of exceptions, which I'll explain shortly. The other day I was out for a ride for about an hour and I was cruising down the highway when suddenly, the engine started bogging down, losing power but not dying. After pulling over, the bike was still idling but would cutout when I gave it the throttle. I wasn't out of gas, I knew there was gas in the tank, but I switched to reserve and still no change. So I struggled to drive it about 10 miles back to the house. So now the bike still idles OK but cuts out when I give it the throttle.
But about 3 weeks ago it did the same thing while I was cruising down the highway but it only lasted about 1-2 minutes and it cleared up and was running OK again. I thought it was maybe bad gas. And about 3-4 months ago it did the same thing for about 1 minute, but then cleared up.
I've now replaced the spark plugs with no change, the old ones looked OK anyway. So I figure it could be a carb issue or a spark issue.
Is it possible that a coil or wire could give out at increased rpms but be ok while idling?
Does this problem sound like a carb issue even though the problem happens suddenly?
I appreciate any help, I really love this bike, other that these couple of issues I haven't had any problems with it, but now this has happened.