I'm not disagreeing about which plugs are recommened, and I've seen it posted in other threads the recommendation to NOT use anything but what is recommended.
All I'm saying is that I would put my energies into searching for a different solution (at least for now).
Vacuum leak could be a biggie.
Pulling codes again, and reporting the actual codes would be helpful.
__________________
BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee 
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