Low Idle...What could it be?

[PeakingDuck]

Hi Guys/Girls,

My idles sitting in the low 600's and sometimes drops into the 500's, could anyone tell me what may be cause of a low idle?

I have a smallport running on twin webers adapted to a EFI intake, 272cams, a/m ecu....etc....

Any help would be much appreciated.

Thanks,
Richard

[PeakingDuck]

To add to that, the previous owner said its meant to idle around 800-900rpm.

Any thoughts people?

[Stain]

turn the idle scew a little bit?