I have a 1990 4x4 1500 5.0 v8 pickup. I am having compression problems. I had good compression on#1 on saturday (did not drive truck) on wednesday I was restting the tension on the puh rods per haynes repair manual now I have no compression on #1. Can there be a problem with my hydraulic lifters. to adjust push rods I took play out of rod and tightened 3/4 turn after play was gone in rod