problem fixed itself.

The only thing I did was seal the gas filler bowl gasket as mentioned in this post
https://www.crossfireforum.org/forum...tml#post491512.

Then I guess what ever had some moisture dried out.

Since I had the interior pulled out to seal the gas filler bowl, I also removed the flaps in the vent that makes that fluttering sound when the subs are thumping.