Thanks to everyone who responded to this post about Rex/Regina problems. After replacing everything electronic and in the fuel system, slowly and painfully over a year and a half, the last repair did the trick. Replaced the radio interference relay, which was screwing up the fuel injectors, and cleaned EVERY connection point. That and a set of new spark plugs restored reliability and performance. Starts at zero degrees every time and uses less gas. That relay was tested and swapped out early in the game, but didn't fix the problem. Go figure. Now I am good for another 200,000 miles or so. As Sherlock Holmes stated famously, when you have eliminated every possibility, the remaining alternative must be be the solution.