Hi! I’ve got a 2004 Armada 165,xxx miles in it. We recently did a huge move from Co to NY. Since getting here the Armada has had low RPMs when turned on. Today it actually shut off after firing up three different times. It’s starting to have a rough idle which it didn’t have before. We do have an O2 sensor that we haven’t replaced. Could that be the issue? Thanks so much in advance.
If you are getting a check engine light from the O2 sensor then i would start from there. clear the code after replacing the O2 sensor and see if it fixes your problem. I have a feeling your catalytic converter is failing or the exhaust manifold is cracked, if either are the case then you'll have to have the entire manifold/catalytic converter replaced as it's one assembly.
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