I replaced the water pump, and about 3 weeks later i was constantly running hot, very quickly, within about 4-5 miles down the road. I replaced the thermostat, fan clutch, and radioator trying to eliminate the problem, with no help. I also noticed the other day that my oil pressure is at around 0 at idle, then goes up to about 45 when rev'ing the engine. I was thinking about replacing the oil pump to see if that helps, but after that, i cant think of anything it might be.