I recently purchased an 02 z and its bone stock. 30 days after owning it ended up having to replace the clutch no big deal. The car still ran fine, a short time after that the car started having a bit more of a rough idle so I figured maybe it needed some maintenance. Did an oil change and cleared the maf sensor and air filter. The car still was the same. A few days later i noticed the car has lost power when at partial-wot. All top end is gone. I have replaced spark plugs and wires added sea foam to the crank case and tank. Still having somewhat rough idle and no mid to top end power. The other night the cel came on and pulled that 91416 code which i cleared off but dont think that has anything to do with the power loss. Any ideas guys?