1996 Buick Century V6 - P0341 and P0441 Codes After Plug/Wire and Belt Replacement

Hi everyone, I'm writing to seek advice about a recurring issue with my 1996 Buick Century Custom (V6 3.1L engine). After having the spark plugs, ignition wires, serpentine belt, and tensioner replaced at a local shop, I noticed the 'Service Engine Soon' light came on immediately upon picking up the car. The vehicle initially misfired in cylinder #1 — which was resolved during the visit. However, after returning home, the check engine light turned back on, and the car began running roughly again (though not as severely as before). I took the car to O'Reilly's for a diagnostic scan and received two fault codes: P0341 and P0441. I'm concerned whether these codes are related to the recent work done or if they might indicate another underlying issue. The P0341 code (Crankshaft Position Sensor A Circuit Range/Performance) could potentially be linked to the spark plug and wire replacement, especially since those components affect ignition timing. However, I'm less certain about the P0441 code (Evaporative Emission System - Purge Flow Control Malfunction), which typically relates to the fuel system or evaporative emissions control — not directly tied to spark plugs. I’m wondering if I should take it back to the shop and request a re-inspection, or whether these codes might point to something else. Any insights from owners of 1996 Buick Century models would be greatly appreciated. Thanks in advance! ~Stephanie