I'm having a fairly sever cylinder 1 misfire. I've replaced the plugs and wires, changed the fuel filter, changed the pcv valve, replaced the camshaft sensor, and repaired an exhaust leak. What are some other possibilities for the causation of this problem?

 

maybe u screwed up the fireing order

 

did u recently get a tune? if they made a mistake that could be doing it

 

it was misfiring before i changed any of the things. and i didnt mess up the order of the plugs. im positive. I also haven't gotten a tune. would getting a tune help?