My gas dryer will not fire. When I turn it on the igniter gets red and it stays that way for a period of time but no flame. Ive read where it is said to be the coils (ive had this problem on another dryer and it cured it). Ive replaced the coils and still wont fire.

Ive put a meter on a few of the other sensors (thermostats, thermal fuse) and im getting 120 on both sides.
The flame sensor shows 120 to the terminals (black and white) but when the igniter starts up the voltage disapears....... igniter stops power comes back.

Im at a bit of a loss........