That is sputtering may be, it is there but my car had it too at idle it would sound like eeeeeeeeeeeeeeeeeeeeeeebugeeeeeeeeeeeeeeee
imagine the above sound yourself
anyway i changed the spark plug wires from orange china one to OEM ones from bilal ganj (sorry @xulfiqar but had no choice..) as new ones were near 5k it went away
do yourself a favour check valve clearences by yourself whenc ar is cold and by cold mean when your car was not started whole night and you check in morning 6 am