Cold compression on Cylinder 4 is about 300 PSI
I have my rabbit injector in it now with no change and in the rabbit it was fine, I had this problem last year and when the pump guru said it was junk I was hoping I had a chance at it running after the new pump.
I have no way of pop testing right now, but want to be able soon...I saved the post of the build your own pop tester with a bottle jack.