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Nissan Sentra burning oil and fuel, bucking at 40 to 60 mpg
Nissan Sentra 2002 GXE 119000 miles. Bought used and I have been experiencing blue and black smoke with "bucking", does not stall. I am not driving it not knowing what is wrong. Replaced cam sensor, added seafoam to fuel and replaced PCV valve, cleaned rear cat and replaced oil and filter. Air filter clean. It is actually running worse 
I have been told cat. Converter and or seals. I do not know what do, repair or junk. Help please, need to do something this week.
Thanks
Sue
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Answers
What trouble codes were present when the car was scanned by computer? That's a good place to start.
P0011 cam position sensor which I replace. Also, did a comparison test 180, 160, 160, 180. It is also blowing white smoke intermittently Replacing spark plugs some carbon and wear. Still can't pin point problem. Thanks for your time, Sue Murphy