Firstly 0100 can trigger on a vauxhall if it stalls !

0130 can be triggered by misfire

0505, I would suggest washing all the throttle body out, removing the idle control valve and clean thourohly

if a vauxhall has champion plugs this also adds to the stalling crisis. Fit GM plugs only and make sure lead set is genuine. Electrical noise from plugs and leads can trigger air mass and cam sensor faults galore on one of these.

The misfire may be caused by a tiny air leak , vacum pipe, throttle body gasket/spindle worn & injector seals and manifold gasket need checking

if the idle speed screw has been adjusted this can cause lots of idling problems, these are set by a voltage reading through the TPS sensor and idle speed is controlled by the valve

If the idle speed control valve doesnt end in an x then its a very old,valve and the later ones that were improved had an x on the end of the part number

always remeber, back to basics and check air leaks and plugs etc first ! very important. Do not use WD40 to search for an air leak as it contains silicon which can damage the HEGO sensor

Thanks doc will try those things. Yes when it did start happening I adjusted the throtle cable and the idle screw to stop it cutting out on idle. As to the TPS can you expend a bit more, I take it means throttle position sensor? where is it. Should I back the idle screw off a bit and see what happens?

Many thanks