My car started running badly and had diagnostic run on check engine light. Cylinder misfire on 3 and 4. Replaced spark plugs, wires, and coil. Same problem, same codes, down to the number of cylinders. It's my only means of tranportation so i have to drive it a few days b4 i can get a mechanic to check it out. Seems like at times it misses on more cylinders than those 2, but 3 and 4 are the only ones throwing up codes. HELP!!