The only thing that I see to be concerned about, and is a current code, is the LF wheel speed sensor which will the ABS and TCS codes.
The rest, I would clear out, and check and see if any reappear. The ABS and TCS codes will self clear on your dash once the speed sensor starts reporting...
Its a corrugated flex pipe that goes from the exhaust manifold to the air filter horn, to help warm the air...
Looks like this usually
https://www.ebay.com/itm/371436768786
Called the Factory Pre Heater Duct here..
Most have been removed by putting on a Edelbrock Air Filter housing, or...
I call them Jesus Clips... Cause when they go flying off, they either hit you in the eye/cheek, and you yell Jesus, or fly off into some nether region of the shop, and you, again, yell Jesus!.
Some of the GM TB's will partially open after the engine/ECM are powered down fully. This is to prevent the throttle plate from sticking in the bore from buildup or metal shrinkage/expansion.
From Google:
The "T37" Pontiac refers to a series of muscle cars produced in 1970 and 1971, known for being a stripped-down, budget-friendly model based on the Lemans platform. Originally part of the Tempest series, the T37 was offered with a variety of engines, including powerful V8s, and was...
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