yevgenievich
I'm Awesome
Really sounds like the exhaust pipe connection to the the egr
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It very well could beAnother vote for sounds exhaust leak related.
Thanks for the help, I don’t know off the top of my head if there’s a hose like that on my intake though, id have to double check.When I put my MPFI kit in a several years ago on my '96 vortec, I broke a little chip off that vacuum port on the upper intake that connects to the brake booster when i removed it from the manifold. I should have just took the hose off but I didn't. I couldn't find the little piece in the intake when i hunted for it, but I knew it was in there somewhere. I knew what size the chip was because I had the other half and I had an idea which cylinders. I also took a little piece of the vacuum port and burned it to see if it would consume itself quickly. Based on all that and the size of the chip, I figured it would blow itself out the exhaust valve or simply vaporize and I could remove plugs later and bore scope for it was a problem. When I fired it up, sure enough it rattled like yours but not as loud, went away after about 20 seconds. I figured it either ejected out the valve or burned but the truck runs great. I got lucky.