The timer knob makes a clicking noise, if i try to turn the gas dryer on, it will make a constant buzzing noise and it wont start. I check continuity on the thermal fuse, cut off fuse and thermostat, all of them are fine. Clean up the vent and blower housing and also check the door contact. All good.

SOURCE: kenmore 90 series gas dryer

possible motor overheat ..if unit has a lot of lint or has had vent problems now or in past lint may have accumilated around motor and caused it to overheat and shut off.. probably to late to save motor

SOURCE: series90 electric dryer no heat

I would say check voltage at the element to see if voltage is making it there. If it is, replace the element. If it isn't, track from the timer back to see where you are losing voltage.

SOURCE: Kenmore Dryer only lights gas sporaticly

replace the igniter. The ignitor is the most comon problem with gas appliances checking continuity does not tell you if it is bad or not it has to draw a certain amount of amps to open the gas safty valve and the is no safe way to check this on most gas dryers

SOURCE: Thermal cut-off blows and high limit thermostat is

in this case we put the lower temp thermostat in the oven at 170 degrees till it was hot and measured with ohm meter and it was open. After it cooled down some it went back to being a short. Now with this part in the dryer and the new high temp thermostat
and it blew shortly after being turned on. A possiblity is that there is a short by passing the 150 degree thermostat and the element keeps being on and causes the 350 degree thermostate to blow.

SOURCE: My Kenmore series 90 gas dryer (lint screen on the

hello.
You likely will need to replace the 2 coil valve solenoids at the top of the burner. These safety coils may gradually fail over weeks or even months giving partial heating and longer dry times. As the coils are going bad, they will work for just a brief amount of time, then after a half hour or so of cycling on and off to maintain the drum's temperature, they'll break down and cease to open the valve.
http://www.repairclinic.com/PartDetail/Gas-Valve-Solenoid-Set/279834/3479
This link here will show you what they look like and how to replace them, along with some more helpful tips.
I really hope that you find this helpful. Helping others is what I love to do. If you need any further assistance, I'll be happy to help you if I can.

Thanks,

Mike