i have a 98 jeep grand cherokee v8 5.2 it bucks and loses power could that be a 02 sencore?

check the cat. or plugs.

I certainly have a 2001 Jeep Grand Cherokee; in spite of the undeniable fact that that's a 6 cylinder. i'm getting approximately 19-21 interior the city and 24-26 on the line. i could think of a V8 could get extremely decrease than what I experience. i admire my Grand Cherokee. that's been relaxing to stress and intensely sturdy. in case you have become a sturdy deal, i could say, "decide for it!"

When does it do it? When the engine is cold, warming up, at running temp? At what speed? In what gear? How long after starting? Does it do it when driving, idling or both?

Could be an O2 sensor but it depends when it does it. If it does it when the engine is warming up it could be a faulty heater element on the upstream O2 sensor(s).

O2 sensor.......Or Idle air control motor......Been there....a couple times.