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97 gmc vortec 350 running slightly rough at idle it has 118000 on it and looks like it has never had anything done like cap and rotor or any sensors any recommendations on what I should do first?
Vortecpower
Cap, rotor, wires and plugs, and if they've never been changed, probably the Oxygen sensors as well.
Check the EGR valve, make sure it's opening properly and hasn't caked over with deposits. Get a new gasket before you remove the EGR valve.
A PCV valve would probably be a good idea.
Of course, make sure all of the filters are in okay.
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∙ 15y ago
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What is the difference between sensor and a actuator?
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