The proper tool name is a feeler gauge and for spark plugs, it's not crucial to gap them (just make sure they have a gap lol). Unless they are for race application then measurements are necessary. And for spark plug wires, I bought a set of the MSD wires and had the exact same problem you did with the misfire, turned out to be the 6th cylinder plug wire was closing onto the plug all the way. To fix it, I just took some long needle nose and clamped the inside together, by the way I HATE MY MSD WIRES. I'm switchin to factory as soon as I get the time. Don't waste your time with aftermarket, stick with Toyota, at least in my opinion, hell if you want the MSD wires you can have em from my car for free.. haha.
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1987 Toyota Supra 7M-GE Natrually Aspirated Automatic
http://www.cardomain.com/ride/2385905
Currently enrolled in UTI (Universal Technical Institute.. ya ya say what you want bout the school lol its got some nice benefits though), have about two years of auto experience so far.. only 18 years old. My supra's older than me :P
-Phil
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