..60k km when you bought it 2 years ago....so now, what does the "clock" show.?
What you describe has been told in same words several times here and timing belt was the culprit quite often...so I'd check for those cams...what you say is strange...pull the T-belt cover http://www.geocities.com/lmp4203/kiasport/timingbelt.jpg and make sure this issue is cleared out first before looking for other oddities.
The word is change the belt before 70,000 miles, that is 110k km...I'm about to go by that rule.

Otherwise....is the CEL ON?
..and yeah...Sporty has a temper....!