2003 350Z SES - Codes p0300 and p0021
 

I have an 03 350Z, (36,000 miles) and my SES light came on recently. I pulled the codes and I'm getting a p0300 and p0021. From reading through the forums I see that the codes =
p0300 = P0300 Random Misfire
p0021 = P0021 Intake Valve Timing Control
Since they both occurred at the same time, I'm assuming that the p0300 Random Misfire is a RESULT of the p0021 Intake Valve Timing Control. I wouldn't imagine that I would have more than 1 coil fail at exactly the same time and also have the timing control issue occur simultaneously. So that's my first question, is my logic correct here? If not, does anyone have any insight in to what might be occurring, especially on a car with such low mileage?
Also, I think I understand what the p0300 Random misfire means, but I don't know how the p0021 intake timing control works. I'm assuming that this is some type of variable timing control to maximize efficiency at different speeds, but I don't know what the code usually indicates in terms of a fault. Does a sensor need to be replaced?
The symptoms of the issue are rough idle and a slight but definitely noticeable loss of power while driving. Also, if I accelerate quickly my SES light begins to flash, but it goes back to constantly lit within 10 seconds or so of normal driving.
Any insight on this issue is appreciated!