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I got it.
After everything that I did, finally I checked the fuel system and it was working perfect.
Then, while looking around one more time, I noticed a burned vacuum hose. This hose is about 2” long and goes from the EGR valve to the BPT (back pressure transducer) valve. I replaced it…and bingo, it did it. The pickup accelerates beautiful, have plenty of power, and the noise disappeared. I hope this may help others having this problem.
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