can someone please help me i just tried to install a k&n pod filtre on my 2004 lancer VR-X and then my car started to act funny. i reseted the ecu then it started to get better but the next day in the morning the check engine light turned on then the car started to get all jittery(unstable). so i put the stock air filtre box back on then did the reset thing then the 10 min idle and it went back to normal no more jittering. then i drove the car then the check engine light came on again and it wont go away.
whats the prblem please help