Reply To: 2010 GMC AFM lifter failelure. Replaced, still misfiring.

[Richard Kirshy]

You show a high of 190 and a low of 167, That is beyond the considered “normal” tolerances when doing compression testing.
Along with that, you show a low (relative) compression on cylinder 7 which happens to be the cylinder that is misfiring.
BTW … what is the vehicles mileage???