5.0 MPI runs for a minute, beeps and shuts off

[OllieC]

Mercruiser 2005 5.0 MPi 0w037286
This a new phenomenon. I replaced the starter, manifolds risers and elbows, plugs, wires, and thermostat. Now when I start it, it runs for a minute, beeps and shuts down. Then I go to start it again and it beeps and shut down sooner. Seems a little rough at idle. Only one beep. Not sure what the one beep means.
Any help would be appreciated

 

[OllieC]

Figured it out. Plugs 7 & 5 where switched and my IAC went out at the same time. Not bad for a 16 year old IAC. Switched the wires and had a spare IAC - all good.