Question about 1999 Chevrolet Silverado 1500

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Runs rough all speeds

Took it to a garage but mechanic cannot figure it out.

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  • weezieb57 Dec 30, 2008

    I have 150,000. It does not run rough all the time. I tried injector fluids. The check engine light comes on periodically.

  • weezieb57 Dec 30, 2008

    At first I thought it might have been bad gas in tank however, put premium in tank with dry gas still does runs rough. I replaced fuel filter. Any other suggestions?

  • weezieb57 Dec 30, 2008

    Any suggestions from any mechanic that has seen this type of problem?

  • weezieb57 Dec 30, 2008

    sporatically idles rough randomly and drives rough. Appears to random cylinders misfires. SES does not come on but the service engine light comes on.

  • weezieb57 Dec 30, 2008

    thanks will check that also!

  • kevin carpenter May 11, 2010

    frist how many miles are on the mtr? is the ses light on ? by running rough do you mean it has a rough ilde all the time hot our cold ? how dose it run off ilde dose it miss let me know kdc744 thanks

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First thing i would do is place a vacuumn gauge gauge on the mtr 17 to 21 inches of vacuumn is good and a steady needle. i execpt to see your reading a little lower than that because of the miles, and if the needle is not steady you may have some valve train wear.have you checked the timing now would be a good time, with a vacuumn gauge . when it runs rough dose it do it more after coming of the hwy after you have been running at hwy speeds let me know kdc744

Posted on Dec 30, 2008

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Have you changed the fuel filter on the frame chanel under the passenger door??

Posted on Dec 30, 2008

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