Sharpy2019

Hi all.i have just got an 02 grand voyager thursday.the guy I got it off told me let it warm up untill it reaches half way.it was warm when I got to the guys I had a 200 mile run home to Sussex with the bad weather closing in I heard what falts he told me an those he didn't!today being cold I warmed it up untill quarter hot and tryed to drive so see the falt.put my foot down the lights on the dash day go on an off car judders twice it cut out but it starts fine both from cold and stalling.im a total newbe when it comes to these baby's.dispite the falts it's a smashing motor .hope someone can shed some light on this it only dose it from cold.