5.7 hesitation ??

'97 5.7 k3500 with 81k on the motor. In the last few weeks it has slowly grown to have a hesitation, slight lack of power when accelerating. Almost a bit jerkey like it was mis-firing. This would be true while in
park and reving the motor too.
I had the fuel injectors and pump replaced new about 12 months ago. Spark plugs, wires and cap too. Exhaust doesn't smell bad. Any thoughts?
Thanks in advance, -scott
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I'd get the computer read for error codes, but it sounds a little like a bad oxygen sensor.
Brian
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