GE Dryer not staying hot

My LP gas dryer is not staying hot. When the dryer first starts up from cold the flame ignites and everything is good. After the dryer warms up the flame does not ignite. The igniter stays bright orange. I have replaced both coils and the three thermostats in the rear. If I hit the front of the dryer the flame comes on. Could I have received a bad coil? IS there not enough current for the coils to work? Is the gas valve that is "sticky"? Something else?

[SIZE=3]If the igniter just continuously glows the flame sensor (heat detector) may be bad. What should happen is the flame sensor (heat detector) detects that the igniter is on and opens turning the igniter off when the igniter is turned off the gas valve is instantly turned on and the gas is ignited. [/SIZE]
[SIZE=3] [/SIZE]
[SIZE=3]When you hit the dryer and the flame ignites does the igniter cut off? [/SIZE]

http://www.appliance-repair-it.com/range-repair.html

Yes, the igniter stops glowing.

Yes, the dryer is now working. I replaced the flame sensor and the dryer is cycling properly.
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