oven wouldnt maintain temperature

First I removed the oven grates and then the metal plate that covers the burner and igniter.Then I removed the two screws that hold in the igniter,be careful because the threads on the sheet metal screw strip off easily due to the heat. Then I slid out the storage drawer on the bottom of the stove.Next I removed two screws that hold on a cover in front of the gas valve where the igniter is plugged in.I unplugged the old igniter, removed it then replaced it with the new one.I then reassembled everything in the reverse order.I did have to use a nut and bolt to replace the damaged sheet metal screw.