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.