[jlong]

I agree here that the nature of the issue being reported over 5 cylinders is less likely to be a coil pack or spark plug issue. I concur with JFP, it could relate to the MAF (mass air flow) sensor not sending the correct airflow information to the ECU so that the fuel can be "matched" appropriately when injected into the cylinder thus causing a misfire due to the imbalance (or stated another way: the engine is "hunting" for the proper balance of air/fuel mixture).