Well, had a fun afternoon diagnosing the problem...I get the plugs in after I clean them up. Take test drive. Cylinder 5 misfire. Get home, change coil pack; notice that some wires are NOT connected firmly to the plugs. Correct that. Take test drive. Cylinder 5 misfire. On the way home, stop at O'Reilly's, and pick up two OEM-spec plugs for the one cylinder. Odd, the car starts and runs fine, but the 'Check Engine' light is still on. Get home, change plugs. Take test drive. Car runs better, but now there is a misfire in the #4 cylinder! Looks like the Autolite plugs are not the best for this application. I am buying another pair of the NGKs tomorrow, and putting them in the #4 cylinder. Maybe that will solve the problem, and if it does, I will just complete out a set of plugs...