Car is a 1999.5 2.0. Upon starting the car, the car has a ticking noise that over the past few weeks has gotten alot louder and is now heard from inside car with windows up. Car shows a misfire code in cylender 3 and 4. When i saw code i replaced the coil pack thinking it was shot. changed oil and added lucas oil additive. Made no difference. The ticking does not go away at higher rpms just ticks quicker. the check engine light only comes on when pulling a big hill in 5th gear with load on the motor. It flashes and you can feel a power loss. Any suggestions???