Yes, pull the air filter and look behind to insure that there's no blockage, critters have been known to take up residence in long parked bikes. You should also have four, not three vacuum caps. Two on the carb bodies and two on the manifolds.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
