00' civic with idle problems

[brandon18]

I have a 2000 Honda Civic that recently had a OE engine swap due to the original engine locking up. The car idles really odd so I took it to a local checkers and ran a test. Found code PO505 came up so I took it back to the shop and they place my original IAC ( Idle Air Control). Seem to be good when I left but later on that night started to idle really rough again. I was wondering what else I can look into to resolve the issue with the idle so I can get my car finally back, I was told to clean the mass air flow sensor, could this resolve it?? Any suggestions would help out alot.

 

Thanks,

Brandon