Well, I found out why I was getting the woof, woof, woofing when my burner was running. The temp was too low. I had the PID set to 200 degrees and sometimes it will overshoot the temp and I noticed that when it got around 210 or 215 things would even out. I upped the temp to 220 now and it is burning smooth again! I'm not saying that the oil is actually that temp, but that is what the thermocouple is sensing. I never gave it any thought because we had been talking cooler temps earlier. I guess each system varies a little, so it is a good idea to experiment a little.
Later....