1995 Ford Thunderbird

Yes when I bought my 95 t bird the check engine light was on and when you punched the pedal to the floor it would start to choke. Let up and it would continue to go faster. At 3500 rpms it would do this. Evan in park it would choke when the pedal was pushed to the floor.I put it on a code reader and it said bank 1 and 2 oxygen senors and egr valve no flow.I changed the 2 before the pre cats but not the ones after and I did not fix the egr.A month ago I was parked waiting for somthing and I all of a suddan started runing rough.I pushed the pedal and barely anything! I had to trottle it back and forth for like 5 mins to get it to go! This happend a couple times a week for the past month! And the last couple of time it has got worse I could smell like porclin burning! I got it home and it did not want to start so I pulled the battery cable to reset the computer it would start but only with the pedal pushed and it pop in the exuast and stall and findly it stayed running not great though. Nd then it cleared up some so I tried to take it for a drive.I punhed it and for the first time it took off like crazy, full trottle!Never got full trottle be fore!Then whin I went to stop tor a light near by I stalled and it would not start.I pushed it to the side. Findly it started. It ran rough untill I just abouat was home when agan I could get full throttle but as I pulled in my home it stalled and would not start.A few mins latter it started and ran a little rough and then again I could get full throttle then when the rpms dropped it stalled and did not want to start un less I held the pedal down. It would sudder pop and stall!After I would get it to run the same thing full throttle and it would stall.I looked at my exuast and it was smokeing some. The back main cat was starting to glow. So later I cut off the back main cat and still the same. Cold it will start run a little rough smooth out a little bit get the engine warm, able to get full throttle and then not want to start un less ihold the pedel down some. It starts back fires and stalls. Also I smell gas. Like parchaly burnt. Also the car use to ping under load. Please help me!