Hey, I've got a 5 litre EL, and the idle is madly hunting up and down when the engine is cold, and it only smooths out a little bit when it's warm. The car the engine came out of used to be on Gas, and someone has chopped one of the wires going to the ISC, I re connected it, and then it idled really fast and still hunted a bit, I cleaned out the ISC using the same method as mentioned in the tech doco on here (I know the tech doco is for a 6cyl but it will still apply to a V8) and it made no different what so ever. I have checked for vacuumn leaks by spraying WD40 and Rost off all around the intake, it made no difference, all the vac hoses seem intact, what to I check next?

Gab

how far is idle hunting up & down?
Clean MAF..
Check timing..
Reset idle and tps..
Is it missing at all?

Yeah I'd be checking how far the throttle is open. I'd bet the TPS is well over 1volt.