My Cadillac vibrates when in idle or stopped position

2004 CADILLAC SRX
178,000 MILES
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MZTEEPOWELL
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My car vibrates when in idle or stopped. I notice that this happens after the car has been running for a while.

The check engine light came on so I took it to Auto Zone to read the codes. They printed me a report with no error codes. I asked them to repeat it and still nothing.

There are few messages that displays across my radio when I start up my car.
1. Service stability system
2. Service brake assist - ABS light is on. Is this a cause or effect of the stability system failure?
3. Service tire monitor -when I got my car, it had the wrong sized tires. I have since replaced the two rear tires with P255 60R17 but the two front tires are still incorrect. They are P245 60R17 and should be P235 65R17. Is it possible the previous owner disconnected the sensor to install the wrong tires?

Your help and advice is much appreciated!
Feb 19, 2016 at 6:08 PM
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MZTEEPOWELL
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Also when I feel my car it does not inmediately crank even when it still has gas in it. And for a v6 engine I think the gas consumption is too high.
Feb 20, 2016 at 9:41 AM
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MZTEEPOWELL
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I am noticing that the vibration gets worse when I turn my heat or air conditioning. It's more subtle than it sitting in idle without the air condition running. Sometimes it vibrates so hard that I have to hold the steering wheel to prevent it from shaking and sounding so loudly.
Feb 20, 2016 at 9:44 AM
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STRAILER
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it could be engine mounts, check this guide and get back to me with what you find

https://www.2carpros.com/articles/vibration-noise
Feb 23, 2016 at 3:59 PM
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MZTEEPOWELL
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Will do. Do you think that's the issue with the fuel as well? When I fuel up for some reason my car will not crank. Could it be the O2 sensor?
Feb 23, 2016 at 4:05 PM
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STRAILER
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It sounds like a weak fuel pump, have you had it replaced recently?
Feb 24, 2016 at 7:34 AM
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MZTEEPOWELL
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As it turns out the mass air flow sensor needed to be replaced.
Feb 27, 2016 at 5:32 PM
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MZTEEPOWELL
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As it turns out the mass air flow sensor needed to be replaced. It was causing the issue with the fuel tank pressure sensor performance.
Feb 27, 2016 at 5:32 PM
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STRAILER
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O nice, good work this thread will help others with the same problem, the power of the web, please come back and ask us any other questions you have and tell a friend :-)
Feb 29, 2016 at 9:57 AM
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STRAILER
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Thanks again for getting back to us
Feb 29, 2016 at 10:01 AM