Hey guys, I've just recently bought an Ap1 Honda S2000 and I must've only test driven it while the engine was hot. Once bought, the next day I started up the car and I noticed the engine was stuttering or consistently changing rpm while warming up. It almost sounds like the car will stall, but it hasn't yet. When the car is warmed up, idling at traffic lights/stops everything is OK.

Is this a common problem? And is there anyone out here that can advise what to do? If not directly advise a mechanic what to look for?

Please view below video of current problem.
https://youtu.be/9awk0cpF4C0

If it helps, I'm also located in Sydney.

Thanks all.