Duh, Y on earth do we start making assumption when we dont know the ground realities?
-The guy said its a Gli-p model, hence before 2002,
-Before 2002, Baleno didnt had Coils on the tapet cover.
-The minute jerk in the 2nd gear is in all Balenos, Its just related to how u let go the clutch, and accelerate the car.
-The spark plugs can be a culprits. Reason being your cars jerking on low rpms.
-The dirty airfilter could be blocking air intake of the car.
Youll need to elaborate a little further misfiring and jerking are seperate things. Some sensor could also have gone bad.
-Theres also a chance of jam tapets, Get them adjusted as well.