07 Ford Fiesta tdci jumping (vid)

[benhd1994]

Need some help, this car has almost got me jumping off a cliff right now. bought it in February about a week after it started jumping there's no set reason it could start up fine then about 20 minutes later all of a sudden spaz out and start chucking like it's having problems with fuel getting into the engine or it could start up and decide it's going to straight away so i sent it back to garage I bought it from because it had warranty and they decided it was a diesel injector how they discovered what one i'm not sure but the got the part and replaced it went to pick it up with hope and glory in my eyes.... they told me it was sounding better and running fine... it's not it's just as bad but atleast i haven't had complete engine failure like i did before a couple of times. anyways any suggestions? would be forever thankful i'm completely out :(  here's a link i literally just filmed and i started it like 5 seconds prior to filming it https://sendvid.com/vg19jo6s