Micra k 11 year 2001 1.0 lt manual Bosh type with pipes

[Tich]

Hi

Looking for advice on throttle body acquisition at reasonable cost.Fist time the idle would not hold,so I have replaced the throttle position sensor,it cured that for a few days but now it is intermittent yet still not maintaining the engine speed at idle, once it warms up the revs go high and low on their own.

Any pointers plz

Many thanks

Tich