Maybe....let me give you a little background..
From the time I bought the bike last november up untill now, here is what it would do....Start perfect hot or cold...Idle fine, never had to mess with it...All RPM's all gears, no matter what, it seemed to run perfect....
Saturday: I went to go take my skills test for my MC license...Bike started fine...I drove down a couple miles and got gas...hit the road and drove to the test site...Bout 35-40 miles...Bike ran like a champ no problem...
I sat there for two hours before I got to take my turn...Fired up the bike, no problem. Idled fine and I drove it over to where you start..They did 4 of us in the line...I was #2..Idled fine while I waited to take my turn..Did 5 of the skills, no problem...after I did #6 and came to a stop. I noticed the tach was about 1450-1500 up from bout 1100..I checked throttle, choke, etc...all good so I reached down and idled it down with knob...Finished test....Went and got the stamp and left...Drove bout 15 miles...all good. Stopped went in and got something to drink..Came out started, no problem then drove about 30 miles and stopped...Was there for about 2.5 hours...Left there and drove about 35 miles back home...no problem...Sunday I drove it. Started, idled, ran perfect...Tuesday I rode it to work..No issues...I went and got gas on break, no issues....then when I left a little while later I went a few blocks and stopped to make that call and shut the bike off for 5 minutes..Started back up (hard starting) and it would not hardly idle sounded like a 2 cylinder..Tach was about 800 so I idled it back up. It was sluggish off the start the first time, then cleared up...drove bout 30 miles at 60 mph with a few stop lights on the way...No problem all the way there and all the way back...
I would think vent would not cause this...Sounds like idle ports were blocked a few times and cleared out...Everything above idle was fine...