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  1. Chevy Silverado Forum (GMC Sierra)
    2003 GMC Sierra 5.3 Vortec I've been chasing this issue for a while. This will be a lengthy post so bare with me. The problem I have is a semi consistent rough start and rough idle. Around 50% of the time it takes 2 cycles of the key to start. I've tried cycling the ignition and that doesn't...
  2. Chevy C/K Truck Forum
    HI, I recently installed a rebuilt 350 into my c1500 and the truck runs but it's exhaust reeks of gas and is smokey. The injectors are spraying contant at idle. I can feel the injectors clicking. Only thing that appears to help is manually pinching egr shut and it idles great but hesitates to...
  3. Chevy Tahoe Forum (GMC Yukon, Cadillac Escalade)
    Hello, I have a 2010 Tahoe with the 5.3 vortec ~115K miles. I get a P0303 when I idle for a long period of time (~5 Minutes or more). If I drive it a few times without idling (warming up using remote start or waiting at the bus stop with the kids) the code goes away. The Tahoe still has a...
  4. Chevy C/K Truck Forum
    I have a 1994 Chevy C1500, 5.7L engine. My truck idled high and struggled to accelerate so I finally got around to replacing the idle air control valve. This didn't fix the problem and it continued to idle high. I determined the issue to be a vacuum leak, so I replaced my vacuum hoses and...
  5. General Chevy & GM Tech Questions
    I purchased a 1990 Silverado C1500 5.7L stepside last year. It ran a little rough when it got warm so we did all the normal things to try and fix it. As we were in the process of figuring out the issue it would get worse to the point I would put it in park and give it a little gas at...
  6. Chevy Silverado Forum (GMC Sierra)
    Hey guys and gals, Long time creeper, first time poster. I currently have a 2011 silverado 1500, with 163,622 miles on it. It's a 5.3 vortec engine. It smokes from the exhaust a light blue exhaust that's mixed with a grey/white exhaust. It stops smoking after roughly 10 seconds of running...
  7. Chevy Silverado Forum (GMC Sierra)
    New to the forum and at a loss. Starting with a 2000 Silverado 5.3 275k never had an issue till about 2 months ago..started witha couple hard starts..then subsequent engine light indicator. Put an obd on it and got a p0300 random misfire. Changed plugs and wires since they were probably due...
  8. Chevy Silverado Forum (GMC Sierra)
    I got an 2006 GMC Sierra 2500 with the 6.0 vortec. I had to get the engine block replaced because of some gouging in the cylinder walls. I had everything that was good from the old motor put on the new and it ran fine for a while. After like 2 weeks of driving it the rpms move up and down and...
  9. Member Garages
    My truck is a 1998 Chevy k1500 5.7 and it is idling rough when it’s warm not noticing any misfires and no engine codes other than my catalytic converters code but I have a cat delete. Anyone know what the problem could be?
  10. General Chevy & GM Tech Questions
    Hello, I have a 2008 Silverado that intermittently has starting issues. It cranks for a while and spits and sputters then usually dies, if not it runs rough with surging idle. I recently installed a brake controller and noticed it signals overload or short every once and awhile but I can’t...
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