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Sorry to read about your problem, I hope this helps you out.
ok it seems you have a offset issue, you need to purchase a oven temp gauge. See what the unit read's, lets say you set the oven for 350, does it read 320 or 380. 20 min for 350 is little on the long side, you may have a gas pressure issue.
I would get a 2nd opinion on this matter. and no, they are not all like that.
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Is this oven gas or electric? If it is gas then it can be normal to see 30 to 50 degrees difference in tempature. The tempature in a gas oven works on the average tempature. For example: The oven tempature may rise all the way up to 370 degrees. Then the burner will shut off. And then the tempature can drop all the way to 330 degrees. Then take 330 and add that to 370 then divide that number by two and the average tempature will be 350. If your oven is electric then the tempature should be much more consistant but can have a 10 to 15 degree variance. Also the standard oven tempature guage that you put in the oven or even the temp guage built into the oven are not very accurate. We us a Fluke meter with a thermocouple to calibrate an oven. So to check your oven for proper tempature regulation you will first need to let the oven pre-heat for about 15 minutes. Then place the thermocouple in the center of the oven. If the oven is electric the take a temp reading every 5 minutes and average them out. If the oven is gas then you will need to take a temp reading when the tempature reaches it's highest and lowest points. Take at least 5 consectutive readings and average them out. You should get an average within 10 degrees of set temp(350 degrees). If it is off by 35 degrees or less you can usually caluibrate the thermostat back to proper temp. This procedure can be different for each range model. If it is more than 35 degrees off or you are getting irratic readings then the thermostat or thermostat components might need to be replaced.
Probably the RTD is going bad. That is a resistive temperature device. It changes resistance over temp and feeds a voltage back to the oven controller telling it that the oven set temp has been reached. If you are not reaching your temperature then I would suspect the RTD.
If the element glows its ok , if you have replaced the sensor with a new one it can only be the control board. in some cases you can adjust the temp. through the control , it should list directions to do so in the manual. Good luck
how do you know it is dropping 100 degrees ?
If the set temperature is 350-400 the heaters will work untill the thermostat will read that the temperature is reached - after that the heaters will shut down and the temperature will drop...and after few minutes when the temperature goes below thw set point (in this case 350-400) the heaters will turn on again - this will happen for the duration of the timing you have selected (example 45 minutes)
Sounds like that ignitor is weak. When the ignitor glows it builds up resistance to the gas valve for gas to come in. If it sometimes takes 10 min then the proper resistance isn't there and this will give you that gas smell. Replace the ignitor and this should solve your problem. Can expect to pay $80 - $100 for the part.