My whirlpool gas dryer modle lgr660pq1 will tumble endlessly and will not dry. the burner sounds like it comes on for a short time and kicks off then on again in a few moments. it never gets hot enough to dry and the timmer seems to never move. it will spin all day if you dont stop it. I cleaned out the venting system thinking it was blocked up ( and it was) but this didnt change anything. Any suggestions from the pros? thank you for your time and input.

i have cleaned out all areas. checked all the thermostats and thermo fuse for ohms readings. i ran the dryer and see the igniter lighting up and then goes out after a few seconds. the igniter turns on and off at about 45 second intervals. it will fire the burner once in a while but not enough to heat anything.readings with ohm meeter are :
thermal fuse 0
operating thermostst: red/white to red = 0
purple to purple = infinity or open
thermal cutoff = 0
high limit thermostat = 0
flame sensor = 0
valve coils are: 2 wire 1350
3 wire: black to blue 1425
black to white 575
blue to white 575
have i missed anything or is it all within good ranges. now im lost as to where to go next.
Thank you again for any help you can offer.