Is any one know whay engine shakes on warm start ,but on cold start it's all good,My car is Fabia 1,9 sdi 2000 y

From memory, this may be EGR related.

I decided I needed to clean or blank off the EGR on my SDI and my symptoms were that the car was a bit lumpy at idle plus light-throttle + low revs once fully hot. All issues went away and car ran well above maybe 1500 rpm or if given heavier right foot.

Thank you, I will try block egr valve.

Just clean it Jaskoas, no need to block it.