A month or so ago I had a couple of my spark plug wires end up laying
on my headers and getting burned through, which of course caused a bad
driving experience, bucking under accel, etc., I replaced the wires as
soon as I found out that was the problem, I also replaced those 2 spark
plugs, the dead cylinders were fixed of course.. but now I'm having
problems at cold startup and at anything above say 80% throttle.  This
is a 93 5.0 btw.

  At cold startup, it starts fine, but it runs really poorly, if u
give it too much gas to quickly it dies.  After it warms up for a
couple minutes it is fine at idle, and at part throttle through all the
rpm range, but no matter the rpm, it accelerates fine till you get to
about 80-90% WOT then it noses over and loses all power, almost like it
hit the rev limiter, it will also backfire at times if you keep your
foot in it.  I had just replaced my O2 sensors about 6 months ago, I
was thinking maybe having 2 dead cylinders messed the one up, but at
cold start and at wot is the only times that it doesn't use the o2
sensors correct?

  I replaced all the spark plugs, all looked good, maybe a little
lean, I also have an A/F gauge, which does it's normal bouncing at
idle, but falls off the the lean side of the range as you accellerate,
and gives no reading at WOT.  What do I need to look at next.. FPR?
The plugs say it's running fine, or a little lean, my A/F gauge says
lean on the part throttle tip in period.. but it acts like it's loading
up on fuel, so I'm confused.. any help would be appreciated.