Chasing a fuel problem

Kkirwan71

the other delaware guy
Aug 2, 2015
2,790
438
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Hey guys its been a while but here I am. So I put a new fuel pump in my truck about a week ago thinking it was the root of my problem also replaced the regulator (twice now as of 20 minutes ago) and gave the throttle body a good scrubbing. My issue is there's a buzzing noise coming from what seems to be the regulator. And I have a rough idle and a stumble. But here's the kicker, with the fuel pump and regulator it straightened out for a few days then started all over again
So any ideas? Truck is a 2000 ecsb z71 with the 5.3

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