HELLO MR BEAN

Keep in mind that the position of the oven control switch could also play a part in keeping the igniter sparking. Does it continue to spark throughout the entire range of the switch? Hmmm...if your spark igniter for the oven comes on with the other igniters, then obviously they are all controlled by the same spark module and that can't be a problem. If the igniter continues to spark and won't shut off then it could possibly be a bad oven control switch. Something is keeping that igniter on...I may have to get back to you on this one. I'll post back later today with (hopefully) a better answer for you.

It sounds like your gas valve regulator (oven control) may be the cause of your poor flame quality on the burner. Another thing that can cause this is the orifice being shut off too far, or clogged. The orifice will be located near the main regulator UNDER the oven tray. This is where the gas line meets the bake manifold. You can adjust the opening by turning a sleeve to allow more air. The more air in, the higher the fames. The less air, lower flames. What doesn't make sense to me is why the broiler burns normal, but the bake doesn't. I believe they are both controlled by the same valve regulator. As far as the igniter is concerned, I still think this may be the switch causing the problem. If the igniter is sparking then obviously it is not the electrode. If the igniter does not shut off, then I would suspect there's a short in the switch causing it to stay on. So...I would venture to say that the gas valve regulator switch would be a likely source of some of the problems you are having, and might be worth the effort to replace. I hope this helps.