Dale, you hit the nail on the head. 80 dollars and two minutes work. Thats all it was

i have a Coleman Furnace, Last night i lit the pilot, it took a while for the funace to kick on even with the thermostat kicked way up. It finally kicked in, ran for 30 seconds or so, and shut off. it did this continuously for a while. I cleaned out the A coil, filters are clean, thermostat is worki...