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Car engine misfires but only at idle how can I fix this?

Jf144p
Car: 2006 nissan Altmia 2.5 (4cyl)
Mileage: 199,675
Recently replaced: crankshaft position sensor and tranmission output speed sensor

*note* car also has problems starting back up after it been running for a while and when it does finally start its does the following
•Almost cuts out
•Idles roughly
•Idle then goes back to normal but then it starts to misfire at idle only
Updates:
18 d
Quick update: so i was taking the spark plugs out today just to check them really quick and it turn out on one of them the ground elctrode was bent upward. Im gonna take care of this immediately, but could that be the possible cause of my problem? (However i still do intend to check all the other problems you guys have listed)
Car engine misfires but only at idle how can I fix this?
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