running lumpy under light throttle

[Cornish_172]

Hi need a bit if help my clio ph1 172
When under light throttle it runs lumpy kinda sounds like it's missing until I put my foot down a bit more and it seems to clear allso has a bit of a sticky throttle
What i'v done so far new spark plugs cleaned throttle body new coil pack

 

[Mr R.]

Could be injectors, what plugs has it got?

 

[Iain C]

Id start with plugs and leads. What leads did you put in? Ecp? What plugs have you gone for too as Phase1sr has said

 

[Cornish_172]

I got the recommended plugs can't remember what ones but they were not cheap got new HT leads do you think it might be worth getting some performance HT leads