Ge dryer wont heat up

I have a dryer that wont heat up, about 1 week ago it started to shut off when drying and after it cooled off it would kick back on. Now this week it wont dry at all. I can hear the flame kick on but seem to go out within a few seconds. I clean the lent vent out all the way to the outside of the house. Does anyone know what this problem my be? Is it expensive to fix?

Please help

Thanks

Most likely the problem is a bad gas valve coils.

Here are the breakdown diagrams and Replacement parts for GE DBVH512GF0WW | AppliancePartsPros.com

Gene.