So my mustang did what most do with blowing out the spark plug. One of my good friends sold me his stock heads for cheap so I had the heads changed. The Drivers side head was a newly remanned head with almost no miles on it. When it was finished, I had a skip on Cylinder 5 (front drivers side). I figured it was a COP or spark plug since the car had been sitting awhile until I got the money up to change the heads. I changed both out and no difference. It was also getting fuel as the plugs would be covered in fuel when I pulled them out. I checked compression and it is low when running, but will hold compression at TDC(doing a leak-down test). I am pretty sure either it's the cam followers or springs as the motor ran fine before changing the heads before the spark plug blew out, so I am automatically eliminating piston rings. I want to know if there is anything else I can try before pulling the head back off again.