Setting a stock idle on a modded pump!?

[306Puggy]

mine idles about 700 cold without struggle then about 900 when warm

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(11mm on veg)

This is really strange, maybe the 11mm pump helps? As soon as I go below about a 1k RPM idle for veg it starts to really play up from cold, like rattling, starting with a "vroom" and then dying again, not starting without my foot on the throttle, etc. I almost wonder if there is some sort of blockage in the fuel lines like a piece of rubber debris were it shouldn't be causing the pump to have to work harder to pull the fuel through hence why it needs a higher idle to be steady on veg.

Try winding the throttle arm back and the idle screw in.

How do I do the above?