2001 Silverado 5.3, Only rough when Cold. - Page 3 - Chevrolet Forum - Chevy Enthusiasts Forums

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Old July 28th, 2015, 4:00 PM
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2001 Silverado 5.3, Only rough when Cold.

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Old April 25th, 2018, 8:19 PM
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Having issues with my 2000 Chevy Silverado 1500, runs very rough at an idle when cold. It will almost die then Rev way up to 2000 rpm all on its own. tried plugs and wires and replaced mass air flow. If I unplug the mass air it actually runs fine other than idles to high. But it always sounds like I have a huge cam in it at an idle and seems to not have all the power it used to. Can't seem to figure out what the deal is. Its not throwing any codes either
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Old April 29th, 2018, 7:17 AM
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I would check the intake manifold gaskets. Probably need to be replaced. When they go bad, they leak air when cold. After the engine warms up, they seal and don't leak, and it runs smoothly.
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Old April 29th, 2018, 8:08 AM
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Just replaced my intake gaskets and now it runs great at an idle but misses down the road. Completely backwards from what it was doing any suggestions
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