I have a 2003 6.0 truck. It's been a little down on power recently which I was thinking was a injector which probably still is. Now today after towing around a small trailer my truck feels like a dog. Also it sounds as if there is a turbo leak possibly. It's almost like the turbo whistle continues longer than it did before. Also truck seems to just drop boost after 2000rpm.
Yea that's your turbo barking/ not good so don't do that too much, it's basically a type of surge, I would recommend you or someone else give it a good cleaning, maybe a rebuild kit cause why not and if you want you can get a billet compressor wheel while it's off and install one of those and you won't have that bark/ surge happen anymore or at least rarely
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