Question about 1999 Chevrolet S-10 Pickup

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Truck shakes when stoped at idel

I changed the plugs, wires , distributer cap, and rotor still shakes any ideas?

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I am going to guess you have a 4.3 vortec. Common issues with the vortec is the CSFI system needs to be cleaned, the valve on the poppet valve (Fuel Injector) is dirty with carbon build up. You can have it cleaned at the dealer with a machine or you can try with using the common fuel injector cleaner. The other thing that works well is to add one can of Seafoam to a full tank of gas and run it through until it's 1/4 from empty and with a second can of Seafoam, Try cleaning the upper intake by following the instructions on the can, there will be lots of smoke just to warn you but it's safe. DO a search on Youtube on Seafoam to give you better idea on how it's used.
At worst, your CSFI system is far to gone to be cleaned and will need to be replaced. The good news is that you can upgrade your CSFI to the MFI system that does not have the same issues as the CSFI and take about half the day to replace. Auto Zone or Napa , and the Dealer sells the MFI upgrade to your fuel injector system.
Thank you for using fixya and good luck and inspect all your vacuum hoses for cracks and any other damages.

Posted on May 08, 2010


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