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I have the exact same problem.
We have had a relatively mild winter, but when the temps drop to the single digits, it runs rich, so rich that it floods VERY easily. Once it floods, it will not start until we can bring it into a garage and warm it up.
I have replaced the secondary fuel pump in November and did the plugs and distributer in September.
Right now, the car is at my wife's employer's parking lot. I have removed the plugs and dried them, reinstalled and tried restarting. It fires and chugs as if clearing the flood, then quits firing. While trying it, I had the jumper cables running to it from another running vehicle.
The last time that it happened, I had it towed to a shop and they warmed it up and dried the cylinders out and it ran fine. The mechanic said that if it happened again, that he suspected a sensor, but did not say which sensor.
The last time when it did happen, I had pretty much blamed it on my daughter's inexperience at starting an FI car (this is her 1st car and a friend was trying to coach her during the starting process which flooded the car.)
I owned a 240 with the same motor and never had a problem, even in -20 temps. This one has me stumped.
Tom B
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