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.