Some easy things to check:I checked my codes, nada code 55.
Any suggestions now? This is beyond frustrating.
Make sure they didn't accidentally tighten your throttle cable (or reroute the cable) when doing your TB cleaning. A little bit of unnoticed tension will easily add 500 rpm when it's supposed to be slacked.
Make sure your IACV is functioning happily. if they cleaned the TB without pulling the IACV, it could be gummed up and stuck in one position.