1999 chev suburban overheats

1999 CHEVROLET SUBURBAN
140,000 MILES
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DJDREECE
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mileage is in km
The vehicle was imported into Namibia by the namibian government.
all documentation states that it is a 1997 model, but according to the vin number (3GNGK16F7XG253498) I'm told it is a 1999 model????
I have recently had the the turbo replaced, black smoke out exhaust is much better, but vehicle overheats when towing or going uphill - basically, whenever vehicle is placed under strain.
PLEASE HELP!

Will make donation if answer helps. I promise.
Apr 9, 2012 at 8:59 PM
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RASMATAZ
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Black smoke indicates too rich of mixture-The transmission could be slipping have it checked out-let me know
Apr 9, 2012 at 9:09 PM
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DJDREECE
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thnks for speedy reply, black smoke is fine since turbo replaced.
My major problem is the overheating. What should I be looking for?
It's as if the vehicle has more power on somedays and out of the blue it will feel sluggish?
Apr 9, 2012 at 9:13 PM
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RASMATAZ
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Is the check engine light coming On? Also might want to check the exhaust for restriction and also the fuel pressure
Apr 9, 2012 at 10:59 PM
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DJDREECE
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One thing I have not mentioned is that I have a diesel automatic model.
Engine light comes on sometimes...then goes off by itself.
I am having injectors replaced with marine grade injectors in the next 2 weeks.
Sometimes the car feels sluggish, and other times not. Basically, the hotter it gets, the more sluggish it becomes...
Is it time for a compression test?
Apr 16, 2012 at 1:47 PM