Yep.. that was the problem. I found a video on youtube where they used a wire brush to clean. i could not find that at Lowes, so I just used my garden hose with a fine stream spray setting and flushed it with water. The water sprayed out evenly through the burner holes, except a few that were blocked. I used my finger to clean the debris until water came out evenly through all holes.
I hooked it back up and the burner was all blue flame on high... just like the day I bought it 2 years ago!
Thx for your help.