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98ramdodge
Novice
Oct 12, 2011, 11:25 PM
Post #1 of 2
(2001 views)
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i have a 2007 GMC Sierra 4x4 new body stylewith 4.8L motor. When in park at idle it idles at 700 rpm and has a little shake but u can barely feel it but its noticable and it goes away and comes and in drive the truck idles between 450-550 rpm and shakes sometimes too but not a hard shake is this normal or what? almost feels like its misfiring but no code is shown truck only has 60k miles
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Old 396
User
Oct 13, 2011, 2:58 AM
Post #2 of 2
(1968 views)
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Re: 2007 GMC Sierra
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Rule out misfires and vacuum leaks. Do a scan for error codes even if the MIL is off. A scan is FREE at Auto Zone, Advance Auto Parts, and O'Reilly Auto Parts so you have nothing to lose. If a code (or codes) are present, post them so we can see them. Replace the fuel filter if not recently replaced. Try a few applications of a product called (SEAFOAM) motor treatment. Ask for Seafoam by name in a good auto parts stores. It's an excellent product that works.
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