mjose

so i've check everything on my yukon. i've replaced spark plugs,plug wire sets,coil,and also had to replace cylinder 1 valve spring. After doing so i started to have cylinder 4 misfire si i went head a replaced the VLOM from GM and still have cylinder 4 misfire, i've checked fuses and they seem fine compression was fine as well i do not hear any ticking noice but when i replaced the VLOM i noticed that my truck was shacking signifacntly less than before the VLOM replacement. and now im at a loss about to open up the valve cover and maybe the head to check whats goin on. any help will be highly appreciated