Question about 2004 GMC Sierra 2500
3,5,8 are cylinders .code says miss fire and the amount of times.truck has 68,000 miles
Have you put new sparks plugs in it. If you havent I would try them first. Only run the ac delco plugs listed for the truck. I have had many people come threw the shop with misfiring and trucks running like **** and come to find out they put bosch or ngk plugs in it. Your manual says there good for 100,000 miles but there really only good for about 75,000 or so. Also run some lucas fuel treatment or b12 chemtool. both you ad straight to the gas tank. If it calls for one can for 20 gallons buy two and double the treatment it wont hurt you engine.
Posted on Mar 01, 2009
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Posted on Jan 02, 2017
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