sorry, i meant stock coil pack harness. have checked TPS-0.45v, clean the AFM, all the hoses, the only thing i haven't clean is idle air control valve. I have also tried richen the AFR to 12.5:1 and reduce mytiming by 2 degrees and lower myidle rpm to 700rpm, which reduce the hunting by 70%, now only a little hunting which still not smooth.
Thanks for all the input guys.