96 Accord bad idle in gears

[college man]

If coolant and air are coming out on its own. Then that would explain the loss of coolant which now will take in air.
Replace the bleeder and top off the coolant. Re bleed the system.

https://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats/solving-cooling-system-problems