Hello, I have a gas Kenmore dryer and it would not heat, so I replaced the thermal fuse; however, the problem continued. I took the back off and observed it while it ran. I observed that the flame was on for a couple minutes and then it went off...so no heat. I uplugged it and made sure there were no lints plugged up anywhere...and then I ran the machine again. I observed the flame go on, heat was on and than off again in a couple minutes. What do I need to do now? Do I need to replace the air flow meter? If so...where is it located? What is your recommendation.