Help!! Stang is bucking

[syburstang]

Hey all,
At about 2k rpm my car is bucking or surging. I've checked all the vacuum lines and they look good. I plugged in my trusty scanner and it gave me a code 33 and a code 44. I'm fairly new to all this electronics stuff so I have no clue. The code 33 is egr related and the 44 is thermistor related. Could an inadequate fuel pump cause this. I also noticed that on the track when I'm balls to the wall my engine tops out at 5k (works fine if I slowly accelerate). Also, my tps, egr, and iac are fine. Any help would be greatly appreciated.

Steve

 

[Daggar]

Please post combo/mods.

 

[syburstang]

New 302 block standard bore, tfs tw heads, tfs track heat intake, e303 cam, stock forged pistons, scorpion 1:6 roller rockers, new pushrods, bbk 70mm TB & EGR spacer, usual cooling stuff...new radiator, thermostat, smog stuff still intact, but no ac or heater stuff. I think thats about it.

I know I need to upgrade my air/fuel system....ie bigger mass air meter, injectors and fuel pump...that might be part of the problem

 

[syburstang]

ttt