I have a bryant gas hot air furnace model #397HAW036100. It has been nothing but trouble since day 1. here's my problem this year again. Purge fan kicks on gas valve goes on to pilot lights. Clicks on gas valve and pilot goes out. Does this about 6 times before it locks out. Last couple years replaced pilot assb. (LH680005) and it worked fine for the winter months. This year same sitsuatiion. Replace pilot assb. But with no further results. Pilot comes on but goes back out. Could it be a bad pilot assb. From new or something else?

Sounds like you have a bad firing valve