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I have a 2003 Subaru WRX and it's been having some issues with 4th gear and 5th gear. At first I thought was the clutch slipping because the car would loose power at those gears. I took it to track yesterday and finally the check engine light came on and when I plugged in the OBD II it read "Misfire - Cylinder 3" any idea what could cause it?

The car would start up now, but after tracking it I think it gotten worst b/c now the car would start up rough but I can still drive it around.
The car has 130K miles on it and I'm worried if I don't get this fixed, it could lead to other mechanical problems. Any help would be appreciated.

Could it be spark plug? What should i try first?
 
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