Started juddering when out the other week. Got car checked for codes. Had misfire on number 3. Changed injector and loom which goes to injectors as told was common fault. Drove car and pulled a bit better but still juddered when foot hard down. Computer said no misfire now though. Took off egr valve and cleaned it but wasnt really thst dirty. Put pipe on egr and sucked to see if opened as was told should do by sucking it. Shoild that work like that ??. Also have changed map sensor and air flow meter but problem still there. Have you got any ideas what else i could try please. Thanks critter442