vr v8 engine light problem!

[shaneo vr355]

hey guys,my engine light comes on when i pull up at lights,not straight away but if im sitting there a while it comes on and the engines idle speed drops.it then goes off when i start driving again??has anyone out there have or had that problem and hopefully a solution?cheers

[Vee-ard]

do the error code diagnostics and tell us what code it is.