Hey guys. I got my bike back from the shop a while ago, they rebuilt the carbs and did a valve adjustment. Now the bike runs.....better. since getting it back from the shop ive taken it on the highway maybe 5 times, and the last 3 i had problems with it bogging down. I would be cruising around 65 and the engine would stutter, almost like i was in a lower gear and rapidly opening amd closing the throttle. That goes away, and im just low on power. I floor it in 6th, the rpms onpy drop. I shift down a couple gears amd the bike continues to slow down. I also notice the exhaust note will change when this is happening, itll get really deep and throaty. Finally ill pull over and the bike will immediately die. Ill put it in neutral, start it again and rev it up a few times and itll be back to normal.

I dont even know where to start with this. Is it a carb issue? Should i change the spark plugs? Im running 93 octane and a couple tanks ago i put a bit of seafoam in the gas. Any ideas what it could be?

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Vacuum locking in the tank.
Cool.
Buddha.

Losing a cylinder acts like that, make sure plug wires are tight in coil.

Fuel starvation of some type.
Pinched fuel line?
Clogged gas cap vent?
Were the carbs rejetted, so now they need more fuel?
Do you have a fuel filter and if so why and if so is it dirty?