I have double checked the Magnecores and all are routed correctly. The service engine light went out when I installed the Bosch plugs, but after she sat for a week the light and misfires are back. Cylinders 3,4 and 7 which were present before changing the plugs, but only cylinder 3 before wires. The wires seem to be seated in the coil pack so I am stumped.

01 DII 106k

 

That is a tough one, if I remember right you also replaced your coils, are they seated correctly?
I am just thinking out loud here...

 

No, I did not replace the coils. I will recheck the wires into the coils tomorrow. It is tight behind the coils with the Magnecores. She seems to run decent with no load on the engine, but push the accelerator hard and the misfires are very noticeable.

 

If all the wires are tight then look for a defective plug.

 

I know a guy with identical scenario; turns out those Bosch plugs have a high infant mortality rate. That guy was sure it had to be something more elaborate than a defective $8 plug!

 

champion plugs only

 

First try and switch the #3 plug to another hole, if the code follows, you will know it is a bad plug, they will warranty it. If it doesn't change do a compression and if need be a leak down on 3 to verify condition of the valves.