does your a/f jump around on when u accelarate? when u back off its normal to jump around a bit .That throttle sensor is cool just means ur not using the dec feature ,which is bull shit anyway.Check that your lo throttle map is on 0% from 1k-8k if it is then triple check your wiring mainly your a/f signal.If its second hand then it could be faulty ,i bought a 2nd hand safc that just wouldnt let the car idle proply ,got another 1 hooked up the same and worked pefectly