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Q: Cylinder 4 Misfire on 2003 Nissan Altima

I recently had my check engine light come on and after getting the code checked it was determined it was the camshaft sensor. After changing the sensor, the engine light remained on and will occasionally blink. The engine code now is P0304 (Cylinder 4 Misfire). I was wondering where is a good place to start in solving this problem and if it is safe to drive while I diagnose the problem?
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Continuing to drive a misfiring vehicle can damage the catalytic converter, so it's not a good idea to drive it much.
If you cannot determine the problem visually, try swapping the spark plug to cylinder #1, the coil to cylinder #2 and the injector to cylinder #3. Erase the code, drive it and when the light comes back on, and if the code remains in cylinder #4, you just determined all those parts are OK, and the problem is in the cylinder. If the problem moves to another cylinder, then the part you moved is faulty.
Had a very simular situation on the same year and type car,cyl #1 misfire, put #1 sparkplug in #3 and coil #1 in #2 cyl. drove car for two days now misfire code says cyl #4! also check engine light blinks when driving but goes out when stopped at traffic light. misfire usually starts after engine is warm and after you restart engine (like after trip to store) any help would be appreciated!!
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