Vauxhall Astra cutting out

driving along the car juddered and cut out, it would'nt start up again. next day i pulled a few plugs out and it started up again, took it out a couple of times that day and it drove like a dream. the day after i took it out again and all it did was judder and stall but i managed to keep it running until i got home. ive had the the tech2 computer on it but its not bringing any fault codes up. took it out today it ran like a dream to begin with then it started cutting out again, i had the tech2 computer plugged in to it when i was driving it but again it didn't bring any fault codes up. anyone can help ????