Lighting Problem/2 year-Old Ducane Grill. Only the right burner of 3 mains works properly. The

Question

Only the right burner of 3 mains works properly. The mid-main starts to ignite, but only flames out of the top of the grill. Sometimes (by blowing on it) the burner ignites. The left main doen't get gas. I ran a pin into the jets to clear them out. Did not dismantle the hoses etc. Thanks! John