[buickmastermind]

"This is likely an issue of fuel pressure. I recommend, under any circumstances, to have the problem properly diagnosed. Remembering that the fuel demand rises as temps drop, the fuel pressure issue would be the first place to look. If the vehicle has over 60,000 miles on the pump, it merely raises the probability of pump problems."
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Not a chance!

The issue is with the ignition/spark plugs and wires. Some ignition coils, when old or poor quality, fail to work under certain temperaturs.
Also, as was said before, the motor does have a timing chain issue, but that only applies to the 86-87 3.8l v6. The timing chains, when they would jump a notch, would make it so the valve heads hit on the cylinder heads, and get bent. That was the reason for the upgrade to the less powerful, less efficient 3800.