The oven comes up to temp 450 then after the baggels are put in the oven the temp drops to 350 then goes up to 370 it keeps going all over the place we replaced the temp probe but the problem is still there

Is this an electric oven? Sound like a bad breaker to me if it is.

An oven doesn't go to the temp selected. That is the average temp. If you set it to 350, it may drop to 300, then to 400, but will maintain an average of 350. Without knowing your model #, it is hard to say. Some have anticipator (that anticipates the temp and controls the heater and the thermocouple that is trying to keep the temp steady. Some models have an adjustment at the oven switch (rear) that can be adjusted for temp up or down.

Good Morning Friend,

I understand that your Frigidaire oven will not heat to temperature if you set it to 350 degrees. I see that you have to set it to 450 degrees for it to heat up, and then turn it back down to the desired temperature. Please try resetting your appliance, by either unplugging it or shutting the power off at your home's circuit breaker, for 3-5 minutes. Restore power, set the clock and try setting the temperature to 350 degrees. I ask that you please follow up with a comment on the post, at your convenience, to advise if further troubleshooting is needed or if your appliances status has changed successfully. Hope this is helpful.

-Best Regards-
WP

Good Evening!
This is a common problem that Ledgestone Technologies and Fixyourboard.com can solve. The touchpad on your oven has failed and will need to be replaced. Read more about the failure and solution below. Message us if you have any questions!
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Whirlpool Oven Wont Increase Temperature Stuck at 350

This Conversion table is from the old Gas Mark scale
I'm thinking it should be right or at least pretty close.
You could also get a cheap ($5-7) oven thermometer from local grocery store.
Put it inside oven to check actual temp achieved.

Gas mark Fahrenheit Celsius
1⁄4 225° 107°
1⁄2 250° 121°
1 275° 135°
2 300° 149°
3 325° 163°
4 350° 177°
5 375° 191°
6 400° 204°
7 425° 218°
8 450° 232°
9 475° 246°

There are many types of probes you need to specify which particular one you are interested in for all have different charactaristics. How ever in genneral at 350 farenheight = 23.2k ohms. and at 450 farenheight = 8.4k ohms. or you can go to http://www.advindsys.com/ApNotes/YSI400SeriesProbesRvsT.htm

There is a calibration method to adjust the oven thermostat plus/minus 35 degrees if it is a digital display. The method varies depending on the model range. This calibration method is used to adjust the thermostat if it is not keeping proper tempature. For example if you are setting the oven to 350 and the actual temp it is keeping is 325 then you could use the calibration method to adjust it plus 25 degrees to correct the temp. Just so you know electric ovens will keep a pretty even temp but gas ovens will vary by 40 or more degrees to keep an "average" temp. For example the burner will come on when the oven is 330 degrees and turn off at 370. 330+370 then divide by 2=350. So a oven thermometer may not show you the temp you set it at in a gas oven but does not mean the oven temp is off.

You will need to check the oven calibration using a thermocouple based thermometer(the one you stick in the oven is not reliable). Electric ovens should keep a near constant tempature so if you have it set to 350 the oven should stay around 350 once temp is reached. Now gas ovens are a little different. Most use a on/off thermostat and that means the temp can vary from 320 degrees to 370 degrees to keep an average tempature of 350. So if it is a gas oven you will need to let it warm-up for 10 minutes then start taking the lowest and highest 5 consectutive readings. Then add the 5 reads together and then divide the number by 5 and it should be within 10 degrees of the set tempature. If it is off by more than 50 degrees then you might not be able to get it back to proper calibration. The calibration methods are different for each range and depend on the type of thermostat you have digital(push button controls) or manual(knob). The owner's manual for your range might contain the instructions or consult the manufacture's website for the instructions.

The Taylor oven thermometer you bought is decent at best. It is most likely the sensor inside the oven. Has your clock displayed any fault codes? F, followed by a number? Changing the sensor will probably correct the problem.