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Got my truck back yesterday, 04 6.0... was in the shop for almost 2 months getting body work done. Truck had head studs, and egr delete. Had sct livewire tuner. I kept the tuner at my house while the truck was being worked on. When I plugged it back in, I had to reprogram it. Now the truck is slow. Barely any power, and it was very powerful and fast before. I don't even think it could go on the freeway now. Is this a tuner issue, or something else? The engine sounds fine, just can't get up there. Thanks in advance
If you have low "boost" due to either an air leak or a problem with the turbo any diesel will run like a half crippled anemic turtle on the low end. I would check that first.
Thanks guys... got it figured out. When it reprogrammed, I didn't put it back to performance and didn't realize. I knew it was with the tuner. Silly mistake... I just didn't realize.