Need help working on a Residential climatrol furnace. I forgot the model #. I just installed a universal 24v gas valve and new thermocouple the other day. I got a call back today. Tenant complaint of no heat. I went to check it out again and the pilot went out. I relighted it. I checked the gas pressure and it was reading at 3.5 wc. During the 8 or 9 cycle the main burner would puff back and blow out the pilot. I can't figure out what to do the problem. A little help would be nice.