i just got a datsun 280z from a friend, it had been sitting for a  few months and i guess it just needed a battery and the clutch needed to be bled.  i got it running and drove it home, the engine ran nice and smooth.  i had been taking it out every other day or so, just driving around the block, and like the 4th or 5th time i drove it it just stalled.. now whenever i start it it feels like its missing or something, i pulled the spark plugs and they are all coated in oil.  does this mean i need to rebuild my engine??  i mean, it ran fine before, when i drove it home.  i havent changed the oil or anything.  the only thing i did to the car since i got it was put a new battery in and top off the clutch fluid, and fill the gas tank.  the wires seem fine, what type of spark plugs should i get?  whats the difference between the resistor and non resistor plugs?  i was looking at the ngk plugs because i know thats what everyone seems to rave about in this forum, but which one?  there are many different kinds that i have seemed to find that fit a 78 datsun.  i live in california, and it can get to 100 degrees outside.. i dont know if that makes a difference or not.  also, what type of oil should i put in?  since i havent changed the oil since obtaining the car, i know it should probably be first priority.  what grade should i get?  synthetic or non synthetic?  thanks guys. keith