compression

I have a misfire on cylinder #3, It only happens after revving the engine really high then when I idle, it stops working. When I drive up to maybe 25 mp/h it kicks back in and I feel it jolt and is fine until I idle. I have replaced spark plugs for all cylinders, and the coil pack for cylinder...

I'm getting pretty close to pulling the trigger on a supercharger kit, but want to check compression first. I've been Googling this for a while, but I've found varying answers between 120 psi all the way up to 225 psi. Does anyone know what the "perfect/factory" range is, and the "still...