Chasing a Ghost in the Machine, It’s been a year and I thought I had it. Options

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About a year ago my usually good running engine began to stumble, slight backfire through the exhaust, between 1000 to 3000 rpm. I first suspected an electrical fault, as I would shake wires in the engine compartment and the issue would be gone.
This happened several times with different wires. I decided to tin the ends of the wires attached to the positive battery terminal. This seemed to work, for a while.
I began testing other wires for the D-Jet, I had success with reattaching the TPS connector, for about a day.
I began following a post about a member who had trouble with his 123 dizzy, his issue was related to the D-Jet pulse producing erratic fuel delivery.
OK, spoke with the tech person at 123 in Europe, we could test it using an oscilloscope.
I have a small pocket unit that I can test it with. This past Sunday I decided would be a good time do the test.
My plan was to take the car out for a warm up drive, once around a freeway loop gets my oil temp needle to move.
After exiting the freeway, I stopped at a traffic light and the car stalled, I’m used to that happening sometimes as I have a lightened flywheel, but this was different, like I turned the key off.
I turned the key to restart the engine but it sounded like a rattling chain, I never heard that sound before. I tried the starter again, now it had the typical hot start problem, after a moment I got it to run but the idle was now at 3400 rpm.
Since I could control it I drove it home and began checking simple things like throttle cable, TPS loose, MPS held some vacuum using the suck test.
I’m going to take a closer look at the throttle body.
Anyone have their D-Jet idle jump to 3200 rpm and what was the reason?
Thanks,
Mike