Review on Motorcraft SP400 Suppressor Spark Plug by Djmikis Parker

I have replaced the Bosch 4x spark plugs I used in my 1998 Ford Explorer (which worked great) and probably done about 100,000 in less than 6 months with them driven performance loss of Ford OEM spark plugs. Idling is rough, cold starts aren't as quick, acceleration feels sluggish, and gas mileage is definitely reduced. After less than 10,000 with these plugs, I think it's time to cut my losses and get rid of them, even if the replacement is a serious problem, you know where.