Car stalling AGAIN, Updates- none of them good. Options

[rjames]

Drove around for 30 minutes in 80+ degree weather. All arterial roads, so several stop lights, etc. No problems until I was almost home. Car stalled when I stopped at a light. RPMs just dropped to zero. Was able to start it again with a little difficulty and had to keep my foot on the gas to keep it from stalling out again. Power seemed ok though the rest of the way home (I think). It stalled once again at a stop light a couple of blocks from home and then again when I pulled in the driveway. I let it sit for 30 seconds, started it again and it idled just fine. Rock solid at 1000 RPMs. Pulled it into the garage where it sits now.

Prior to today the car has been running and idling perfectly since I went through the FI parts last year, which included installing a 123 distributor, new CHT sensor, a newly rebuilt mps (calibrated for correct afr on my engine), new vacuum hoses, NOS throttle body, rebuilt injectors, new fuel pump, valve adjustment and timing.

I haven’t checked the AFR since last year, not sure why it would change though.
It’s a ‘75 so the fuel pump is in the front, so I can rule out vapor lock I think.

Anyone have ideas as to why it would be stalling?

[rjames]

It's a 2.0 liter. Sorry, should've clarified.

If I change the ECU settings the idle starts to hunt. Really it's been running perfect and for fairly long drives without any issues. No issues detected right before it died when stopping at the light, and then again a few blocks later. Power was fine for the entire 30-45 minute drive, right up until it died. Then power seemed ok I think, but may have been low. Seems odd that it would stall twice in the space of a few minutes, then after sitting 30 seconds fire right up and hold idle just fine (like it did before it stalled).

I haven't taken it out yet, but am a bit afraid to try to take it out to get AFR readings and adjust the MPS for fear that it' will leave me stranded.

Someone suggested looking at the coil. I replaced that last year with a new one. Doesn't mean it couldn't be bad, but how do you test an intermittent coil issue?