Rough idle, spark knock

GMC YUKON
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GOODFELLA937
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Installed new intake gasket, along with a few other gaskets on 1995 5.7L yukon. Engine has very rough idle , pings under load. Possibly EGR?
Oct 20, 2007 at 6:03 PM
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BLACKOP555
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make sure parts where you installed gasket are tightend securley.

did this happen afte rhte gaskets are before?
Oct 20, 2007 at 8:57 PM
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GOODFELLA937
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Tightened everything to spec, just started this after I completed the job. replaced spark plugs and vacuum lines.
Oct 21, 2007 at 10:36 AM
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BLACKOP555
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go back over everything. did you apply gasket sealer to the gaskets?
Oct 21, 2007 at 7:31 PM