Where is the smog pump located &anything else that connects with needs to checke

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Red lights, stops, and park i get high rough idle. Few times car died.. had to keep foot on break and floor it to get it to start and keep it started. Went to O'Reilly they checked light said Erg valve and battery. Replaced them. No change. Cleaned out throttle air intake valve. Very built up. Helped a bit with idle. Now Autozone gave code PO410 smog pump. I have no clue what to do. I'm a single homeless mom. Any direction would be fantastic.