misfire

  1. J

    2017 Sierra 5.3 Misfire

    Hello, I’m new to the forum. I have a 2017 GMC Sierra 5.3 with 53k miles. I have a sporadic engine miss. I’ve had the fuel induction service and I’ve had all 8 fuel injectors replaced. However the miss continues periodically. I can drive it for 20 - 30 minutes without any issues, then out...
  2. H

    Dipstick suddenly High

    I am resorting to here, this is my first post. I have a 2005 2500 HD 6 Liter. Started truck a couple weeks ago at -10F heard a 'pop' sort of thing. Didn't think anything because it was cold. Then I noticed black smoke coming from exhaust. I just let it warm up for 10 minutes, gave it a...
  3. Y

    2011 Yukon XL Denali Misfiring

    2011 Yukon XL Denali 2wd. CEL was giving a oil pressure sending unit failure which is in line with oil pressure gauge at zero. Today I removed fuel rail and manifold to replace oil pressure sending unit. While I had the manifold out I replaced o-rings and gaskets. Being the 6.2L engine I...
  4. B

    Can Random Cylinder Misfire be from Bad Gas?

    I have a 2004 GMC Sierra 1500 that I have not hardly used at all over the last two years. It is my second vehicle. It has a check engine light and I am wondering if it could be from bad gas. Yesterday the check engine light was blinking but today it is steady. I rarely drive the truck and the...
  5. L

    Misfire 1991 Sierra 2500

    Hey Folks, hope someone can help me out. Have a 1991 GMC 2500 Sierra 5.7 liter V-8. Been a great work truck and has always run good. 200,000 miles and has developed a miss. Code light will come on for a minute or two but not stay on. Runs good for about five minutes and then develops a misfire...
  6. J

    So glad to have found y'all, me and my 2001 XL need help!

    ***WARNING*** I need your help but since this my very first thread I'm giving y'all some background info, sorry it's long but I'm not mechanically inclined and I don't have a lot of money to fix whatever is the issue -- I may need my truck to live out of here soon so I am desperate to make it...
  7. J

    Hesitation at speed

    Hello all.... I own a 1998 Suburban 1500. I have a problem where you will feel a hesitation or stuttering from 45-65. Under steady light acceleration or just holding speed, you feel what seems like a misfire. I have no MIL light coming on. I have changed wires, plugs, cap, rotor (vehicle...
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