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Q: Changed a fuel injector, now cranks a lot before starting. on 2004 Nissan Xterra

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Vehicle used to start immediately. When warm but off for 20 mins or so, would start right up but idle rough as if on 5 cylinders, this would go away after a few minutes. Then finally CEL w/code P0303. I replaced #3 F.I., now initial problem is gone, however now has new symptoms:
1) Excessive cranking before it finally starts
2) Runs rough upon start-up for about 30 seconds (hot or cold), but runs fine after that.
3) Recent CEL w/codes P0303 & P0328 (new entries - I had reset the computed after the FI change).
Question: When changing a fuel injector, should the fuel lines be bled somehow?
If not, any ideas for me?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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