What your running into most likely is the push pull cable that attaches to the peddle on one end and the bellcrank at the other is just slightly out of wack. You always want the bellcrank to rest in the detent at the highest possible peddle. The way you adjust this is to loosen the clamp that holds the end of the push pull cable and move the cable either forward out or rearward in under the clamp. Note that it is the outer sheath that you are moving... could just be one end that needs moved in or out or could be both ends. When it is correct you should have quite alot of slack in the little slip on the fuel pump governor control cable at idle.