My pulsar 135ls at speeds of over 80-90 experiences engine jerking once every ten or fifteen seconds kinda like the jerks when you get when there is low fuel..never has this problem before..

Is it because i experienced high wind resistance?? But i felt the jerks from the engine not form the bike as a whole..the engine rpm dint vary when the jerks happened..

And all of a sudden i find the bike hard to start in the morning..never had cold start problem over the period of owning the bike for 1.5years

the bike has auto choke so it raises rpm to 3k to heat engine..when it comes back to idle and when i rev the engine it just shuts down and acts like there is not fuel..even if i manage to start the bike and rev it to 4k it feels like there is no fuel but i have sufficient fuel in the bike

can anyone tell me what could be the exact problem and a possible solution


(ODO - 5500 odd)
(new engine oil put around 100kms back - castrol active xtra 20w50)