I'm not going to run it on 7 cylinders and it sounds like something with a lifter and a valve. I'm almost 100% positive it is.
I'll find out later.
Good Luck Ben!
I`m hoping it is a simple fix for you!

I'm not going to run it on 7 cylinders and it sounds like something with a lifter and a valve. I'm almost 100% positive it is.
I'll find out later.

all valves are moving on the drivers side then why did the o2 fall off.
To get the truck to start we had to flush the injectors because they were clogged.
I need to borrow my buddy's GM Tech 2 scan tool and read it. If I disable injectors, what would I notice or hear?
Basically just listen to the engine And cut out one injector at a time. If the engine stumbles when you cut an injector out or starts missing worse enable that injector and move on to the next. When you get to your trouble cylinder there will be little to no Change in how it's running. Hope I explained it good enough, I have to do it to CAT engines all the time.