P0302, P0316 At wit's end
 

I am having the following issues, P0302, P0316 code. I have read some of the other post and I have tried just about everything. Loss of power, misfiring. I have changed the following items:
Spark plugs, Plug wires, Coil pack, cam shaft sensor, crank shaft sensor, fuel injectors, fuel pressure sensor, PCV.

Checked the following items: compression test: good pressure, checked for voltage ripple, nothing.

Any advice? Please help.