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Anytime the check engine light is on, you should check the computer for trouble codes. The codes will point you in the direction of the problem and what to troubleshoot.
Try a scan, you may have bad o2 sensors which can make it run rich.
Another problem could be a fuel injector that is leaking. You have to remove the plugs one at a time an look at the ignitor see if there is fuel on it to know which injector is leaking.
There can also be problems with idle air controls or even the main computer, but start with the scan. Most Advance and Autozones will do it for free.
Hi I own a cadillac with the same motor. Never smoked but had all the same issues, ran fine cold but after a little driving (less than 2 miles) it shook like nothing else. The cause was the motor self destructed had to replace valves all 8 bosh injectors 2000 dollars later she is like new. Sorry about the bad news goodluck.
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