motors with very aggresive cams don't like to idle..
if the camshaft has a lot of overlap it allows the exhaust gas to slightly dillute the mixture, which is a good thing at high RPM (reduces the likelyhood of pre-ignition) but makes a low idle speed tough to achieve.. Aggresive cams also effect engin vacum at low RPMS, so it may be a jetting problem?
Just think about the local hot-rod with an aggresive cam and how they 'lope' at low RPMS..
Leo
You know the world is going crazy when France is accusing the US of arrogance, and Germany doesn't want to go to war.