I sorted out the new tb problem,....opened up the panel for resoldering as thought this could be the problem. Opened up panel and found the 3 points that come inside to the soldering board,from the outside plug,hadnt been soldered!, tgats why it was so erratic with idling and wouldnt settle!!!. So,soldered the 3 points,re-silled the panel back on,put TB back on n hay-prestow,all sorted,lol.
Cheers for all help and advice ppl,much appreciated.