Yesterday I bought a brand new GS-150 after getting tired of CG's vibratory ride but I am getting a problem. The engine is doing missing a lot when I increase the throttle (as if the bike is intaking air). When I was picking the bike up from the showroom, the guy there told me that it will do this for a while because it is "new and cold". But now I have driven it ~25Kms and the engine is still doing missing. Also, whenever I let go of the throttle, the RPM gets stuck where it was previously for 5-7 seconds, then slowly gets back to ~1.5k RPM.
Is this normal behaviour or should I get it checked?