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How many miles have the O2 sensors been on your truck? I was told by my 'man that knows' that the O2 sensors are good for about 100k as they get clogged up with soot etc and are hard to clean.
I was having lots of rough running isuess with my 96 4.2 at 120k miles and it drank lots of fuel, changed the O2's and all is well. Here in the UK, a set of O2's costs about £100, thats for two sensors, but I think you may have four on yours, ie pre and post cat. One thought might be to swap the pre and post sensors round as the post sensors should have been exposed to less soot and I think the pre sensors are the main ones that determine how the engine runs, but I may be wrong..........

SID.
 
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