As a follow up. I plugged in the old ACDelco CPS and the result was long crank time, as expected & no change to the idle. So I am still leaning on a 5V reference issue at circuit 416 or a ground issue in circuit 452 of the crank sensor. These tests will have to wait and I have transmissions to build. I have an ACDelco CPS coming and it says it is 7 days away. I will try that first, because everyone is so adamant about the the use of the ACDelco parts. I used to be that way too, but in my line of work with transmissions. I have had a lot of bad out of the box ACDelco parts over the last few years. I even made a post on a bad OPS right out of the box that we bought for this truck.Just a shot in the dark, plug in a CPS not installed (in your hand) and see how it runs.
Should trigger some codes also.
Toss the noise filter.