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Now that you mention it, Dave had a crank sensor that was loose in the holder and it just went crazy.

It won't make any horsepower apparently. That's the sort of thing that sounds like fuel starvation. When I had my Prom issue I would get a severe bog sometimes and the changes in the running was all over the map. Eventually it failed bad enough it was impossible to ignore. I am trying to think what changes when in gear vs neutral. The ignition timing should tick up a couple of degrees to pick up the load, like 20 degrees to 22 degrees or so. I think EGR becomes active as engine speed increases in gear. Should be nothing at idle. You could unplug that to see if there is a problem there.

I am going to assume the fuel pressure was checked with a gauge and the new TPS is in the .38-.42v range at idle. It is hard to say if the ECM is acting up, but one thing can be done short of doing so and that is remove the ECM, remove and reinstall the Prom and clean the connections to the ECM and reinstall wiring connections. Be sure to disconnect battery ground before working with ECM. The ECM can be left hanging from the harness to see if that helps the running. It also keeps the ECM cooler while testing. No programming is required for a replacement ECM but the existing prom will need to be switched to the new ECM. I had some Prom communication issues last year but I was actively burning chips and fiddling with tuning and I got some very strange behavior, vaguely similar to yours, but...?

10-4 on that. Only part left was the hub and part of the disc. Another part that isn't stocked anywhere although the motor was available. Kinda speaks to the rare nature even though used on Billions and Billions of GM cars. (thank you Carl Sagan)🙂

They had enough clout to get some brake accumulators made. They state that the brake accumulators are reproduction to the original specs, which also probably means they are likely better than old stock that's been sitting on the shelf for 30 years. Maybe they are getting Monroe to make them some new stock.

This is probably the best, and most important, topic that has been started on this forum. We had a serious problem to solve with the rear struts being discontinued and no off-the-self alternatives could be found. We kicked around a lot of ideas and then came up with some good solutions to the problem. Solving problems and helping each other out is what the ROJ forum is all about. Thanks to everyone who participated!

Half way to keeping four lucky Reattas on the road.

Well I just completed the repair of the headlight motor and replaced the crank arm and it works great now! The old bell crank did look like it was starting to wear out (I'll post a picture of it tomorrow), and all of the nylon bushings inside the motor were completely disintegrated. The nylon gear inside the motor was totally fine. Thanks a lot to @Ronnie, @2seater, and @Ron Walker for their advice. They were right on the money with what was going wrong.