I’m back but…. Have an unusual and different bike :)

[made2care]

I still have my venture with its single carb and she still rides amazing!

I did just trade an old bike for a 1986 Suzuki cavalcade 1400 and its engine looks very similar to my venture. 
have an issue I’m hoping someone could figure out. It has its original 4 carbs and the bike runs but…. It is popping back from the carbs at low idle with slight hesitation.

some have suggested a lean condition. I put in a new fuel filter and have new plugs on the way.

the bike did sit for a few years but the fuel tank was clean .

at higher speeds the bike runs amazingly well but just have this low rpm missing/ hissing pop sound coming from the carbs , which is intermittent.

thoughts??

[N3FOL]

Congrats on your 'new to you' bike.  I really didn't know that Suzuki actually made touring bikes in the past.  I think the more you ride the bike, the better it will run.  As you have stated, plugs are on the way and that is a good start to start and hoping the bike will gradually improve over time.  I am not so familiar on the Suzuki, but basic maintenance of the bike is where I would start.  

[vzuden]

Another thing I would do is sync the carbs