I added a can of Techron to the gas, have gone about 200 miles now with it including fair amount of starting and stopping of engine.
I picked up a used CSV off eBay which was said to be tested and all. Apparently was, works great! Thanks for the link posted in this group for the CSV. I also replaced, of course, the gasket.
What I did notice was my CSV was a bit loose ... apparently over the years the gasket had shrunk some ... I think.
So, after many starts, the starting is much better. And the Techron has not only made the engine run more smoothly, but the flickering of the gas gauge has calmed down. I think that's the Techron cleaning up (hopefully) the sensor some.
Thanks to this group I got my hard starting problem fixed!!!
1983
380SL