checked the fast idle valve and seems to be ok. also replaced pcv valve and hose but still have rolling idle in park. check engine light has not come back on yet. is there any way to get codes with light off? does the ecu store codes? i was told maybe i have an idle air control valve problem. is it possible? is there any way to check it and where is it located? sorry so many ?'s, i just bought this car just to get me back and forth to work and sometimes i dont think it will make it.