Do you have
"a concussive type ignition which is both frightening and often dangerous"?
"Step 1 - Clear the Ignition Ports
Ignition ports are tiny holes embedded in the exposed side of the burners. The restriction of these ports is the root cause for a delay. Clean the ignition ports with the sewing needle. Ensure that you do not increase the size of the ignition holes as this will further aggravate the problem."
Maybe soaking them in some kind of a solvent will also work.