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  1. 02-09 Vortec 4.2L I-6 Engine and Drivetrain
    Had a P0302 reading on my ‘02 4.2. Replaced #2 coil and all spark plugs. Plug in #2 was definitely darker but not wet. Reset computer. Now have P0300 and a more noticeable miss than I did before. Checked each cylinder by pulling coil connection for each cylinder individually. When I pulled...
  2. Engine Tunes/Mods
    First I would like to thank everyone that makes this site possible-it is invaluable! I had a code p0306 #6 cylinder misfire at 75k miles, no mods, regular maintenance. It had a rough idle but performed good above idle. I put in new plugs and swapped coil packs but still had a miss at idle with...
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