I have a Garland six burner gas stove that's about 10 years old. I
like it (though I'd buy something else next time), but the burners
have an annoying propensity not to light when I turn the gas on. It
has electric spark pilots that keep clicking until the gas ignites,
but this just keeps on clicking with no ignition unless I use a match.
This mainly happens on the front left burner.

How can I adjust or fix this?

Thanks very much.