I have a frigidaire gallery range that is slow to ignite when the oven is turned on and when it does ignite it"s slow in reaching the set temperature. Also there is a smell of gas.

As copied from the manual.

Setting a silent control panel
When choosing a function, a beep will be heard each time a pad is pressed. If desired, the control can be programmed for silent operation. Press and hold (start/time) . After 7 seconds, the control will beep once. This will block the controls from sounding when a pad is pressed. To return the sound, press and hold (start/time) again for 7 seconds until the control beeps once

NOTE!
The OVEN indicator light on the electronic display will turn ON and OFF when using the Bake feature and during preheat. This is normal and indicates that the oven is cycling to maintain the selected baking temperature. When the preheat indicator light turns OFF, your oven is ready.

some fan assisted ovens turn on the fan to get up to temperature, its an energy efficiency thing, also mean pre heat is quicker. if you need more info on this unit here is web page
http://www.frigidaire.com/Owner-Center/Product-Support--Manuals/?productCode=LGEF3045KF
hope this helps you.

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Could be range of problems including:

Power not connected/turned off
Ignitor ports clogged
Incorrect operation

Manual is available via Google

Replace the door seals, they are the thin rubber strips around the front of the oven when the door is open. They are simple to change as they just clip on.

Contact a technician. The ignition and gas valves should allow the unit to preheat and then reach needed temperature within about 30 minutes, at the most.

The top element normally operates only when you turn the temperature control all the up to the broil setting as it is the broiling element. If it doesn't work at the broil setting, suspect a bad brioler element or a faulty temperature control.

Hi, It sounds like the ignitor might be getting weak and opening the gas valve conditantly. Try setting a temperature and watch to see the ignitor glow. The flame should ignite within 30-45 seconds. If the flame ignites to heat rith away, it should get up to temp before shutting down.
I hope this helps you. Please let me know if I can assist you further with this issue.

Thanks
Vic

i have an old model of the fridgedare gallery professional series stove. After self cleaning, the ignition sparks for the burners will not come off, they keep clicking and only stops when i pull out the plug. can you help me with this situation?

It sounds like the thermostat is off. This would be the first place I would check.