Did you know?Chevrolet first used its "bowtie" logo in 1913.
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I doubt it's the intake gasket. There's a coolant leak somewhere and it isn't that gasket - these intake manifolds don't have any coolant passageways. I'd say you've got head or head gasket problems.
If you can't find an external coolant leak I'd say it's a good bet that it's getting into a cylinder either through the head or gasket.Sounds like you may have a bad cat too. I don't think any of my cats that went bad ever got hot enough to glow.
possibly a bubble in the coolant lines? i have had almost the same problem with the low coolant always coming on and know leak, i took the top off of wear you pour the coolant in and let the truck run and you can watch the bubbles come up in the coolant reservoir.i never had the truck messing up the way you desribe however
Has anyone just cut the cats out and gone with duals?If so, is there any tuning needed? I guess I'd rather pay cash to have 'em cut out and straight piped if there aren't any negative impacts to the truck...On a side note, this couldn't be related to bad 02 sensors or a dirty MAF could it?