I just ordered my New spark plugs, Delco Iridiums, Taking out the Bosch's that are in the truck as per strong convincing statments made here. If one of my friends asks me to do another tune up I'll try and push the E3's on them and see how they work.
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99 Z-71 5.3 liter. Jet stage 2, volant cool air intake, flowmaster 40 series, billet grill, clear corners, chrome bed rails, pioneer cd player, Infinity Kappa speakers, silverstars.
http://www.cardomain.com/ride/2094079