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Running like poo when cold



  2003 Clio sport 172
for the last few months my car had been running lumpy and had got worse n worse, even when it had warmed up the revs were up n down when on idle.

I have now changed the coolant temp sensor and the revs are stable now when its warmed up....

But...

When i first start the car in a morning its still acting like a carb does when it black spots, i try to pull away and it splutters untill it goes past 1k revs, then it kinda throws you back in your seat and shoots off.

if i sit there and hold the revs just over 1K the whole car shakes really bad. as soon as its warm its perfect.

what could be causing this?
 


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