I am not going to address this specifically to gregp1962 but incase someone new to mechanics is reading this. Some parts of the car work as a system and when there is trouble asking on a Forum only sometimes targets some single specific thing that solves an issue. For the rest it requires some plan/procedure of trouble shooting with the most likely, cheapest, and things you have the skill and or equipment at the top of the list.

Skipping something on the logical list of things to check often has you taking a lot of time and effort and then have to go back to what you skipped and do that any way. And from personal experience what you skipped is often what is causing the issue.

Way back in the 1960's I changed the Points, Spark Plugs and wires on my Truck. After which it would not start.
I chased many random causes before I buckled down and started a logical procedure and I found that when I adjusted the Points I had forgotten to tighten the screw that locked the point adjustment (I found that by re-checking the point adjustment even though I believed I had done it correctly). That was 2 about hours later and one dented fender where I beat on it with my fist. The dent is still there.

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84 300D, 82 Volvo 244Gl Diesel