cant catch a break!!

[coyotes33]

So I still have the knocking sound in my 5.3. The seller won't answer my calls and hangs up when I call from a different number. Today was the second time I took the truck out for a drive to see if it helps the lifters. Once I got back I left it out there for about an hour and went back out to move it. It started with no problems but when I put in gear it stumbles and shuts off. Any ideas? Could it actually be my torque converter or flex plate and that could be the knocking sound?

Here is an updated video with the exhaust hooked up

https://www.youtube.com/watch?v=Vb3B...e_gdata_player
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