Clicting or ticking noise when acelerating

Hi, I have one question. Im owner of Kia Pro Ceed 1.4 80.2kW 109hp 2008yer with 112000km and have one problem. It's only hapends when car is warm and when accelerating, on strait, more under load or on some hill, and only between 1700-2100rpm, car then makes strange noise, like quick clicting or taping, don't know how to propely explain, and as I off gas it's stopes, and only when I puss pedal slowly, when I puss it hard no noise. No any lights goes on of lashing, means on check engine. I'w change cain, cluch, sparks, oil and sound is still there, I hawent change chain tensioners because they told me that they ar perfect. When car is cold there is no any sound, and also in park on n, don't make no sound, even if I press gas from 0-8000rpm's. So its only when is warm and only around 2000rpm. Iw also clen injectors and change pk belt and all filters. So I don't know what to do nex, it makes me crazy. The car even whens clicting goes perfect, no lose power or enythig. When I change sparks they ar like new even afret 20000km, all same, no oil on them, no carbon nothing. I change oil max at 10000km, mostly at 7000km and when I change it its still light coler, and betwin change don't putt no oil because no need, its always more then half, more near max on dipstick.
Thanks in andvance.