Hey Guys,
Looks like I'm late in the game. I have a 1999 Maxima and had the same problems P1320, P300, P304 (at one time). My car only had about 60,000 miles on it but, it was past the warranty period. I bought a OBDII scanner and checked the car out. I also bought a Chilton type manual and read through testing to see if the ignition coils are good. After purchasing a couple of coils from Autozone, I no longer have any problems. Remember, you may have to wait about 15 to 20 minutes for your PCM to get enough reads for it to start running well. The Chilton manual will tell you how to test the coil using an volt meter. My coil #4 went bad. It was driving me crazy. The car would shake every once in awhile during startup and also some times at low idle and low speeds. Good luck!