Running lumpy when cold

Hi there

I have recently changed my fuel lines and both fuel pumps and filter on my 1.8gti and it now runs (which is a relief) but when starting from cold it struggles a bit to keep going and sounds really lumpy and sluggish

Any ideas why would be great

Cheers


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Sounds like your Warm Up Regulator... check the 5th Injector as well 1st.