Having Idle Problems
 

so i just got done doing a SXT to SRT-4 conversion and so far everything been going into place really well. it has a high idle (1500-RPM) and when im coming to a stop the rpm's get stuck at about (3000-RPM) but as i come to a complete stop the rpm finally come back down to there 1500-rpm idle. i replaced the TPS sensor and plug also the idle air and both O2 sensors. when I first initially start it after clearing all the codes it will attempted to idle normal for about 10 secs then it jumps right back to the 1500 rpms where it stays. has this happened to anyone before or does anyone know what going on and what to do about it.