[W126 Coupe] Lumpy from idle onwards

[Dan Gardner]

Hi Folks

    Further to my last posts I have replaced the plugs again,and fitted new 
Bremi plug leads but still the problem persists,if it was faulty injectors 
would my exhuast gas analyser pick it up with a faulty co2 reading?

    Its lumpy when cold,hot and throught the rev range any thoughts would be 
most welcome.

                                                            Regards Dan 
Gardner   1986 560 SEC Euro 220kw