Hi all: Hope someone can help

In December, my '84 GL overheated badly as I was running up I95 through Massachusetts. The water pump had seized. I had it towed back to Maine. For numerous reasons, I didn't finish the water pump job until today. Everything seems fine when I start it, runs nice and smooth, warms up normally. As it warms however, it begins to run worse, black smoke out the exhaust. I think something (O2 sensor?) that's supposed to tell it to cut back on fuel as it warms up isn't working. Maybe something I forgot to reconnect? Or disconnected accidentally? Something the overheating damaged? What should I look for? Where is the O2 sensor anyway?

Sorry, haven't had a chance to buy a Bently yet.

Thanks,

John Flaherty
'84 GL
'74 SB

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