I narrowed it down to a sensor, not knowing witch one I order 4 different sensors. It took about 15 minutes to install. Sadly they were not the problem. But I did figure the problem out. It turned out to be the coils for the gas valve. When I Would turn the dryer on the burner would start and go thru a cycle, it would do this for about 4 cycles then the burner would not turn on. But all is good I should not have any problems with this for awhile.