when i start her up from cold she idles fine but if i touch the throttle the revs drop momentarily and then rise as normal. once warmed up it doesnt do it... any ideas?

 

oh and occassionally when i start it, the revs bounce around a little before settling at idle.

cough**~~

Fuelling?

Sounds like you have an air leak somewhere- you'd need a boost leak detector to find that. May aswell give the throttles a good clean, also clean connectors on idle valve ECU temp sensor and PTU. Those knock-off dremels from halfords have one tool thats perfect for sorting out connectors- its like a little abrasive metal cone.