Let's just chalk this up as weird: the car fixed itself.

When I drove it the other day, it took forever for the engine to get to the point where it switched from running poorly to running correctly. The car was very much down on power until whatever started working correctly. Yesterday, I started it up and it started much better but was idling low for a few seconds then ran perfect. This morning, I started it up and it started normally and ran normally. So we progressed to not wanting to stay running, to not wanting to run, to running but running poorly, to running correctly and I'm not sure I had anything to do with it. I'm suspecting that could have all been related to the EZL but really not sure. I'll just keep the spare ECU, MAS relay, and EZL in my trunk just in case.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.