GE gas cooktop; one burner ignites after lot of tries

My large burner on the GE gas cooktop does not ignite (only ignites after lots of tries - Clicking sound after lots of tries). Gas is there. I also replaced a new electrode and a burner head. That did not solve the problem. The other three burners work perfectly. This burner is by far the most used. Does anyone know if I need to perhaps change the: a) Spark module b) the gas valve or c) something else? Thanks.