Help with old stove

Oven/Range/Cooktop Repair
1

My gas stove seems not to heat the food all of the time
The oven looks like it is on but it takes forever to bake the food
Any help

2

Check your thermostat, it’s probably wearing out, part #AP2141166
Nat

3

Could be an ignitor or a thermastat but first you need to verify if the main burner is liting up

4

Thanks I’ll check it out

5

How do I check the main burner?

6

I took stove apart to check burner
Heres what its doing
Have it set to 400
The burner lights but the flame is very small almost like a warming setting
sometimes you will here a swish and the flame jumps larger
Would this be the thermostat

7

Could be the thermostat or possibly the valve not opening as it should. You may also want o clean the burner out, make sure there are no debris in it.
Nat