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Hi new to the site, read a forum where wrencher answered a question and I was impressed. I an a highly trained technician but not on automobiles, I do enjoy the hobbie of trying to fix my own junk. Here is my issue I purchased a Tahoe with a known problem, I was told it needed a new engine, I have owned several 5.3 engines in trucks and found it hard to believe that this engine was bad. These engines seem to be bullet proof to me. I can start the engine and it almost like it has such bad misfires it wont run, the idle is so rough it shakes impossible to drive even though I drove it on the trailer to haul it home. list of what I have done. Cleaned fuel injectors appear to be fine, checked fuel pressure its great, checked all coils and wires and plugs all is well. One thing I found was someone had replaced the passenger side catalytic converter. I wanted to check to see if possible I had an exhaust issue so when I went under I was surprised to find Im guessing when the new converter was installed the cross member bolts were removed and when they were replaced the 2nd O/2 Sensor on the drivers side wires had been caught between the nut and frame and all 4 wire were grounded to the frame. I thought I had found the problem or at least in the right location after undoing and fixing the wires back ( havent put the sensor on yet I need to get one) so I just fixed the wire back just to try and it still has the same problem. one question is maybe due to the short could it have ruined the PCM?? Any ideas please help.