2003 ford expedition

Miami, FL

#1 Jun 20, 2010
I just purchased a Ford Expedition Eddie Buer 8CL 5.4L this year. I now have 134,000 miles on it. Four months later, now when I start my car I hear a loud rumbbling noise comming from under my truck / sounds like the catalytic converters, however, after a few seconds no more than 5 to 10 seconds later, the sound stops and I do not hear it again. I only hear the rummbling noise in the morning when I first start the car for work and agagin after work 8 hours later when starting the car again to go home. I only hear the noise when my truck is cool, when it is hot no noise at all. it does not ride ruff, shake, loose power or stalls. I have taken my truck to Mad Hatter Muffers and they say it is not the catalatic converters, (BUT WHAT COULD IT BE) please help.

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