So, today I blasted all the gas lines out and pulled the burner unit to see how the flame sensor/ignitor was aligned. I adjusted the gaps as specified in the manual, then also tweaked the flame sensor closer to the flame and the ignitor closer. I then retested the gas pressure with my manometer and checked for leaks with the manometer. I turned on the furnace waited for its various start up cycles and it fired up and operated perfectly. I let it run for 15 min and it operated flawlessly. Thanks for all of your comments and suggestions. I imagine the only real problem I had was a ignitor/sensor alinment problem. I am glad that I removed the furnace and preformed the maintenance that I'm sure the unit needed anyways...