GE gas oven spectra xl44 takes forever to preheat &sometimes will not

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The way the oven works is like so:
1) User sets the desired temperature
2) Power is sent to the ignitor
3) The ignitor is then energized, drawing 3.2 amps of current
4) When the 3.2 amps is drawn, the gas safety valve is allowed to open and gas flows into the burner assembly in the oven.
5) This gas is then ignited, causing the oven to heat.
6) As the oven heats up, the oven sensor, which is the metal rod located at the top on the rear oven wall, converts the heat into an electrical signal, relaying this information to the main control which in turns displaying the temperature.
(In models with a dial thermostat, there won't be a sensor, though a metal wire with a bulbous end will be present, which is actually connected to the thermostat.)
Will all that said, more than likely the ignitor is bad in the oven, not drawing enough amperage to allow the safety valve to open. Even though the ignitor is lighting up and glowing, I'm 99% certain that this is the problem. Here is the part number for ignitor. WB2X9154 and can be ordered from any parts distributor or from a local supplier.
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