Alex-vtec

Hi guys, I got a usdm p30 ecu off a guy online 2nd hand chipped by htune, as soon as I fitted the ecu it caused my car to hunt at idle, I changed a number of things, ivcv, map sensor, iat sensor, removed and rebuilt whole throttle body and manifold cleaning each part, new blox racing tps that has been calibrated, nothing sold the issue so I orderd a new chip from htune, I was so happy to find it had worked my car was running amazingly!! Then about 2 weeks after pretty constant use I pulled up at the lights, out of nowhere but was back hunting from 750-2000 and back, put my old ecu in and perfect again!!!!!!!!!!!! Can anyone help me want to get hondata but if the ecu is broken I don't want to spend any more time or money on this unit!! Thanks