Okay, here it goes...
2002 disco 98,000 miles
New magnecors at 90,000
New Bosch platinum +4's at 90,000
Seafoam at 90,000(worked perfectly)

I just seafoamed it last night(98,000 miles) through the vacuum line from the master cylinder.
Ran fine after smoking the neighborhood up!
went to bed
this morning I started it up and it had a rough idle and minutes later the CEL came on.
Codes are 0300, 0307, and 0308. (Misfires in cylinder's 7 and 8.)
cleared the codes
Codes came back 5 minutes later and of course still an obvious misfire.
The CEL flashes then stays on...then flashes again.
Its parked for now and I checked the plugs and wires...they look brand new!

Any thoughts? thanks for any help.

 

Well, other then using the wrong vacuum line, which wouldn't cause this issue, I am clueless on this one.

 

Yea...I figured I would get some slack for using that vacuum line. I didnt mean to imply that the seafoam caused the misfires, but it is a strange coincidence that the misfires occured the next time I started it up. Anyway, any ideas are appreciated.

 

Okay...I just pulled the plugs and they black on the bottom of the tip and turns into white at the tip of the +4's. Sorry for the confusion before when i said they looked new...i meant just from me pulling the wire of the plug.

 

Did you drive it after the SeaFoam or just run it in your driveway?

 

I drove it for about 25 minutes.
Here are some pics of the cylinder 8 plug...it is covered in black.
Sorry for the poor picture quality..

 

i have removed my plugs and found the same thing, white and clean on one side and black on the other. It still ran perfect. I would suggest a few full throttle accelerations on the open highway, possibly blow out some carbon build up that you broke loose in your cleaning.

 

When i said it was white at the tip...that was not cylinder 8...i had pulled the wrong one. Cylinder 8 is black

 

Replace the plugs.
THE seafoam fowled the plugs,, the +4's have a very small electrode thats easy to fowl.

 

i agree, if it's black all the way around i would replace the set.