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[down the river]

Still trying to figure out what is causing the intermittent hesitation I get in my 93 4x4 22re. It never happens when the engine is cold, only after it has been running a while. When it happens, it feels like the engine only has about 50 percent power. It goes away after a minute or two. It also seemed to first start happening after I would fill up the gas tank. Does this point to the O2 sensor?

Here is the new clue: If I run the engine at idle for about 10 minutes the rpms will drop slightly. If I open the throttle, the engine will sputter and cough and backfire out the intake before racing back to normal.

I've already changed out the EGR valve, and done the wires, plugs, rotor, cap, and air filter.

I'm thinking O2 sensor.....

I'd sure appreciate any ideas or suggestions anyone has...

Thanks