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I'm just going to ask a couple questions so I can get a handle on your problem
What is the oil level like when you check it once is has been sitting for an hour or so
What is the level of coolant in the radiator
When there was a lot of smoke what colour was it and where was it coming from (exhaust?)
When was the last time you had the vehicle serviced
Have you seen any warning lights come on at all in the last several weeks and what has the temperature gauge been doing (moving up and down alot, reading hot or cold?)