Gas Cooker Repair?
Our gas hob has a cover. When you lift it up it allows the gas to come in. When you close it downit shuts off the gas shutoff valve.
It is not allowing enough gas in to light all four burners at the same time. It will only allow two burners to light and only with a small flame (and this is only after squeezing the gas shutoff valve area.
Robert Sherer, January 2009