[blucille]

Thanks for all the suggestions.

I made some progress. I think.

I have a couple of spare CHT sensors with the wrong plugs. They all measure the same resistance at today’s temperature, including the one in the car.

And. The car started like crap this morning. I unplugged the O2 sensor. No difference.

And

I unplugged the CHT and no difference.

Here’s another good one.

I had been running the factory air flap, it ran exactly the same as with an FVD hot wire air mass meter.