98" Chevy Blazer 4wd...took for a ride about 10 to 20 miles down the road and then I hammered it, RPM was @ 4000 and I let off and the vehicle died! It would not start, no oil pressure, the next day I went out and it started with oil pressure @ 40. I heard a little tapping in front of the motor, then after 20 minutes @ idle the oil pressure went to Zero. I turned it off. Could the timing chain be causing this problem????