I am looking for a manual for the Bosch P4 gas oven. When I ignite the oven, the flame is visible, but when I let go of the ignitor (very slowly) it usually dies, but sometimes it does remain burning and then after some minutes, sometimes up to an hour, it dies. There is definitely enough gas. I think it has something to do with the timer, but I don't know how to set it. I think the manual will help.