It will take the oven about 30 minutes to heat up to 350. The oven flame doesn't look robust - It looks small. Also, the gas is making a sputtering sound through the oven burner when the oven heat is on. I replaced the dual safety valve. It seemed to help some but not much. It is still sputtering and the flame still looks small. I have checked the lines from the manifold to the burner and they are all clear. What's next?
Thanks.

Thank you for the reply. That was exactly the problem. I felt a bit stupid. I posted that query late the evening after fighting that and another unrelated problem all day and I was too tired to think. I did a search the next morning and found the answer you ended up providing here. That was too easy - but not cheap. A clear example of the adage about experience being based on good judgement that is the result of learning from bad judgement.
Thanks again. Have a good day.