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Type: Posts; User: jswain

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  1. Wow, you changed your mind pretty fast. lol I...

    Wow, you changed your mind pretty fast. lol

    I don't want to speak too soon, but changing the plugs on mine seemed to help with the spark knock. Since I changed them, I've put about 50 miles on it...
  2. I have an 08 Sierra with the 5.3 that I bought...

    I have an 08 Sierra with the 5.3 that I bought about 2 months ago, certified used with 12/12 warranty. Iron block. It has 54k miles. I changed the oil pretty soon after I got it and have put about...
  3. I have an 08 GMC with afm. It gets 1 mpg better...

    I have an 08 GMC with afm. It gets 1 mpg better than my 94 Chevy did with the 350. Both Z71, 3.73, 4 speed auto. The 08 has 54k miles. The 94 had 212k. It will no doubt make engine work more...
  4. Hey, I'm a new member from MS. I bought a used...

    Hey, I'm a new member from MS. I bought a used truck (08 Sierra) from Serra in Jackson, Tn a couple of months ago. It's spark knocking like a bastard right now, but that's a different thread. Mine...
  5. New member, need some technical help / advice

    Hello, I just joined the forum. Hopefully I'm posting this in the right place. I purchased a 2008 GMC Sierra, Z71 with the 5.3 less than two months ago. It has 53k miles. I've noticed it spark...
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