Nissan - Maxima :: 2003 - Hard Starting After Sitting And Code P0300

I bought a 2003 nissan maxima with 135k and it had a p0300 it had a performance k&n filter on it so i though someone might have installed it wrong or what ever so i bought the car cheap. i have replace the k&n filter with a stock 2000 nissan maxima air box with new filter i got from the junkyard it worked for the misfire calm down a little then i bought the car to a mechanic and he said because of my hard starting it could be a cam senor or crank senors so I've replaced that still no luck then he pulled out the spark plugs and they were sooty black but when i bought the car i checked and they were brand new so i swap them out with ngk platinum spark plugs then work a little but still same problem. i had a p0302,p0304,p0306 when i clear the p0300 but usually its all ways a p0300, its been a month and I am still driving like this.

SYMPTOMS:
Hard starting after 20 mins of sitting
I can smell gas from the driver seat when i start the car and open the window
Exhaust air isn't smooth but in pops
Getting like 14-15 mpg in city
When stopped at a stop light i can feel the car misfiring

WHAT I HAVE REPLACED:
Front bay 3 ngk spark plugs cylinders 2,4,6
Cylinder 4 coil
Air box
Cam sensor and crankshaft senor
Coolant temperature sensor
Battery

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