after replacing IAC and REpaired ECM still high idle and code p0505

Question

after pressin gas pedal car statrs atv high idle 1000 rpm and engine dies after few minutes. replaced IAC after market brand abd repaired ECM. no change stll give code p0505

Answer 1

Measure the fuel pressure , if the fuel pressure is insufficient you would have the same result. , P0505 even though it means there is a idle air control malfunction its job is to maintain a target RPM which it may not be able to do so