My youngest son has a V10 excursion. Last winter it developed a hard miss. We went through and unplugged coils and injectors one by one trying to determine which cylinder and could not figure it out.
Before we went further he ran off and bought a new pickup anyway.
We decided to do a compression test on it finally to figure out what the future of this thing is.
It had new coils, plugs and a bunch of other work when he bought it. So he hadn't touched any of that except for the one spark plug that blew out.
Found this spark plug, oops, not sure what happened, maybe it was like that out of the box, or the installer bent it, didn't know. Ran for a long time like that and still don't think that cylinder is our problem.
Compression numbers so far are coming in around 60 psi, on an engine that has been sitting since like Jan. We squirted some oil in one hole and got 120.
We didn't get them all done yet. Hope they all come in around 60 psi and not a dead one.