Searched for a few hours and found this. I will post a link to what I found for anyone else looking into this problem. Turns out it is fairly common with the hydroflames. BTW, my 1990 Dodge Xplorer has the 8516 ii model as I am sure most other people will have the same as mine.
http://www.wanderthewest.com/forum/topic/3197-furnace-problem/
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