jerking

Hi guys, I have problem with my 1.6 hdi engine( year 2007, 270 000km). It has problem with cold start (sometimes engine can starts on +2 celsius and sometimes it has problem to start on +8 celsius). When I press gas pedal on the floor it accelerates and sometime jerks - (mainly on “heavy load”...

While cruising , the car starts to jerk ( the higher cruise speed the more violent the jerk seems), it looses power 1-2 seconds before regaining normal function. This happened a few times with several months between. Recently this jerking is followed by an ESP/ASR warning light. This clears out...