I have a Goodman GMPN060-3 gas furnace. My ignitor will glow and ignite the burner but will go out in just a few seconds. I have replaced the ignitor, pressure switch, and flame sensor but still have the same problem.The furnace will try to ignite three times before shutting down. Sometimes it will ignite and continue burning on the second or third try. Sometimes it will burn on the first try. There is nothing consistent about this problem. The bad part is waking up in the morning to a cold house. Any suggestions on how to solve this problem?