Looper Shutdown with a rattle noise

[nymack66]

Guys, I fired the motor up in the driveway today , sounds great and starts very easy, problem is she now idles at 3000 RPM with the butterflies completly close and the idle adjustment screw all the way in!
I am currently jetted at .32 for idle and .20 for intermediate
Reason for me asking is Boyesen instructions mentioned on Evinrudes I must reduce the idle jets .5 sizes down and I did not, also I am over jetted currently at .32 hopefully that make sense due to Ferm and I addressing a loading up issue on the old power head which has since blown up and I replace with this new one and I did not downsize on the idle jets
Question is has anyone experience this before? If I reduce the idle jets will this drop my idle rpm's ?