No check engine light for me. I drove around the block after second start up no prob. I tried it earlier today before I typed a response just to be sure. Last time I had low RPMs and a check engine light my IAC was replaced.

'01 Escape XLT V6 on S100 CDT Audio/Ascendant Audio/Rockford/JBL/Knukonceptz setup '00 SE Sport ATX