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Sorry for leaving this tread open for so long. You may close it. Problem was bad O2 sensor it failed open. When you mentioned using an analog meter I remembered the mechanic using a DVM. In a solid state system a DVM could detect the detection circuit in the ECM if there was no connected load...

It's a 2.3L Fuel Injected with a 3 wire O2 sensor

The shop said they backprobed the ECM with the O2 sensor unhooked and found the voltage there. They checked to see if the sensor heater was leaking voltage from the heater circuit and the sensor operation as well. They also said they got a couple of O2 sensor errors, No O2 sensor switching...

I have a strange problem that started with my truck running like crap. I took it in to a garage and they told me that the computer is putting 4vdc on the O2 sensing wire causing the computer to lean the truck out. They got a reman computer from Napa and when they installed it it was the same...