CEL CODE 74 cylinder four misfire help

LoweredDC4

Jimmy
okay after i replaced my headgasket, my car wouldnt start. My timing was off, so i fixed that and now my car runs, but it runs rough and im getting a cel code 74, cylinder four misfire. :/ so i was wondering what are the main things that will make the cylinder misfire before i start replacing parts cuz im trying to save money. so i dont have the liberty to start replacing parts that arent causing the problem. Any help would be appreciated :D
 
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