well my friends eclipse rs(hrc stgae2)still haveing problem after the motor rebuild(howell long rod kit).he fixed his high rev prob(replaced the IAC)but he still has bad ideling prob esp on a cold start.he went to auto zone and got the cel codes,p0505,p0123,p1297,and p0121.most of them have to do with the map and tps sensor.. would replacing these sensors fix the problem?or could it be someting else?

Well if those are the CEL's he's getting, I would without a doubt start there. Those sensors have a major part of air and fuel delivery!!