so i had my car blow a P0505.
1. cleaned IACV and throttle body, no difference
2. bought new IACV, no difference
3. had one of my buddies do the relearn thing, worked
but no on start up i get 1 of 3 things, either it will rev up to 1000rpms and die, or rev up and down from 250-700 for about 10 secs then stay constant at 800 rpms, if i give it gas for about 3 secs right off start it will stay idled at 800 rpms.

any help?? i dont whats going on

 

Throttle Position Sensor??

 

If the old IACV shorted out from an internal coolant leak, your ECU may have shorted ST509A driver chips.