Injectors making engine knock and stutter at 3.5k rpm
KIA RIO III (UB)

All three of my injectors I have bought refurbished from PF Jones and I got them because the old ones caused blue and white smoke on start up and I wanted to fix that. Now, on the new ones there is allot of white smoke and engine knocking followed with stuttering when flooring the gas pedal like it can’t handle it. 

Took it into the local garage and they said the injectors might be over fuelling. 

Haven’t done anything with them yet, need someone to help and I got the tests from when I got them as they are refurbished, can’t tell what’s wrong someone please help.