excessive compression would throw the pistons back causing a timing issue and probably cause a valve strike ( same as the timing belt snapping ) back pressure as its known that for spectrum,

im just giving the basics of the problem as many things can cause this problem but without a personal eyeball Its only a guess

 

I think for sure i have a compression issue in a work van I own engine was replaced with used. The problem occurs when engine is turned off after running and warm then minutes later to restart and barley turns once to start.