Td4 missing intermittent tick over

Hi all, need help again doing a service, removed cover to find no3 injector has been leaking and a nasty carbon build up, long story short and with the help of a home made puller I'm managed to get the injector out, replaced it with a recon for £80 + vat, after a lot of spluttering and popping she started and run like never before, so pleased. I have done 40 mile in her then she started to miss a little in low gear on pull away, i stoped at some lights and she felt like she was only on 3 cylinders, a little lumpy up to 1500 revs then smooths out. I was expecting some smoke black white but nothing. Got her home and pulled the leads off each injector to see if one was faulty, the revs drop on each cylinder. Turned her off and went in for a coffe and a think, went back out started her up and she run perfect for about 15 seconds then stated missing again on tick over. Turned her off stated her back up same again. I'm thinking low pressure pump on its way but don't like guessing, any idea? :scratching_chin:

If the symptoms are only since you relaced the injector then its your problem. Either its duff or not seated properly, are you sure the old washer came out with the injector?

Thanks for the reply David Very sure, it took some getting out as a result of carbon, while striped I removed and cleaned the egr, replace breather and air filter, clean map snsr, just find it strange that she runs fine on cold start up then goes really lumpy, but no smoke at all,

Take it out and check for any sign of blowing back.