Corsa 1.6 sport wont idle ?! Help !!!

[Corsavanged]

When i start the car in the morning it seems to idle ok but once it has warmed up and i stop the car and try and start it again it needs throttle to start then for a few seconds after and then idles again. But when the engine gets hotter then the idle becomes strange and the engine starts hunting.There are Two small vacuum hoses on top of the engine think its something to do with the servo but not sure if i take one of these off it seems to tick over fine again . I also wonder if putting the cone on it has mixed up the air-fuel mixture causing it not to tick over and b slower on acceleration ? Any advice is much appreciated .

[SUPER-MATT]

just a suggestion but it could be idle control valve?

[Corsavanged]

hi mate put the car in the garage yesterday turns out the crankshaft pully was slack and tht put the timing well out and the valve timing was also out. I thot it was a sensor aswell lol.