Ran a call today on a Kenmore slide in model 911.36665897 (GE built). Customer complaint burning food. Since Sept. previous techs replaced control board and the sensor has been replaced twice. I started by running temp test 3 high temps, 3 low temps divide by 6 etc. after 20 minute preheat. I came up with avg. of 367. What concerned me was the ignitor would glow and it took about 90 seconds to get a flame, and the temp swings seemed very extreme. Example Low = 316 High = 436. This seems like a huge swing to me. Anyone have any ideas? I ordered an ignitor and control valve and scheduled to go back next Thurs.