RE: Intermittent loss of oil pressure
Truck literally just broke 100K mileage. Runs fine no unusual sounds, not drop in rpm at idle just the drop in oil pressure. it is a sudden drop to zero at idle (although not always - maybe 50% of the time at a stop light though i don't have a lot of data to go on. i only drove it about 8 miles home once i saw the problem.
98 Jimmy 4x4 4.3L
99 Bravada AWD 4.3L