I've been really busy lately and haven't been able to get to the dealership for a compression test because it is about a 1/2 hour away from me. However, I did get my hands on a multimeter and took 10 minutes to test the coil pack resistances, both primary and secondary. Here are the results (rounded)-
Primary - Haynes manual specifies about 0.3 to 1.0 ohms
Drivers side - 0.9ohm
Passenger side - 0.8ohm
Secondary - Haynes specifies a 6.5 to 11.5k-ohm
7/4 - 12.52ohm
6/1 - 12.6ohm
5/3 - ~12.5ohm
8/2 - ~12.4 ohm
As can be seen, the primary resistances all checked out, but the secondaries were all over 1000 ohms too high. I'm begining to think that this is probably the cause of the misfire. I know that the fine-wire plugs that I installed (motorcraft replacements) require less voltage to produce a good spark because the electrode is thinner - installing them did make the car run better but did not completely eliminate the misfire. This leads me to believe it is a coilpack output voltage problem that is making the car misfire under load, which is seemingly reinforced by the resistance measurements I took. Also, a CEL was never triggered because the misfire is not too violent, just I know its there and it is very annoying.
What do you all think? Thanks all!! :SNSign: