I picked up a 1984 4runner yesterday, with 274,000 on it for just under $1000. I bought this truck fully knowing that it will need a LOT of work to become a good daily driver (it can't pass safety or emissions at the moment). I drove it home, about a 30 mile drive, and it drove amazingly, temp guage was right where it should be. I got it home and took a closer look at it, when i realized that the coolant a nasty grey/black sludge, and the reservior is totally empty save for a small amount of black sludge at the bottom. Bad news. I checked the oil, and besides being very black (not sure when it was last changed) it looked normal to me. I tried starting it up again, and it turned over and over while shooting white smoke out of the tail pipe, failing to start. I let the engine cool down for a few hours and tried again, and it started right up, with no smoke at all. I'm not a very good mechanic, so I'm a little confused. Any idea what could be the problem?