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Main oven surging gas and clicking?

When we put the main oven on there is a small flame at first which becomes bigger but after so many seconds it goes back to a small flame again. When the flame is small there is a clicking. This process is repeated over and over. After about 10 minutes it sorts itself out, most times. Any ideas whey?
funkidiva, May 2010
I forget to mention it is a Cannon Chesterfield C60GCS

funkidiva, May 2010