I have always used motorcraft plugs, or autolites, dont use platinums.
I just installed a king cobra clutch, in place of my frpp hd, in which i paid 240$ to have installed (labor) it was crap, this time i installed the kk clutch in my driveway, the pressure plate on the king cobra has a better geometry, thats easier to push in, but same throwout bearing, and disc, i like it.
Change you 02 sensors to fix the check engine light, or try reseting the computer.
Is you car a hatchback or notch? enjoy the pony 
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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