Hi I have a v280 2001 recently had new chains guides tensioners etc compression is 210 new oxygen sensor,brake pedal sensor temp sensor lots of work! However when starting from cold it us lumpy and actually feels juddery for about 20 mins then calms and runs very sweet again...after so much work I expected a few knockon effects but running out of ideas......anyone have any please?? Or us this normal for a vehicle this age?? Cheers!!