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I have 2004 F 350 6.0. We have been very lucky so far but lately I am having a strange noise when I am hauling horses. The truck has 145,000 miles. We replaced the EGR cooler in June and I just picked it up Monday after it got a new back pressure sensor. I have been hearing a mystery noise since August, that my husband and mechanics cannot get it to replicate. It only happens when I am hauling.

I hauled for the first time Tuesday night and it was letting off a lot of back pressure and I heard the noise again. Last night, I heard it several times. The truck seems to have a little less power once it is loaded. It seems to happen when I am accelerating and on hills. But I have heard it when accelerating on the highway. I am supposed to go to Virginia next week and I am nervous!!! HELP!!!!!

http://youtu.be/L8hV_7W8nGQ
 
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