Nissan Repair: Need Help on 02 Altima, altima, fuel pump

Question
My 02 Altima cranks but will not start.  i loaned it to a family member then had to tow it back, i took it to a dealer and they told me the heads and gaskets are worn due to overheating, also with a cracked radiator. replaced all. then ran good for 2 weeks, all of a sudden the lights on the odometer flicks off and on fast , then it looses power, then it shut's off.Also it takes in alot of oil, and muffler is leaking black water like liquid.  Battery is fine, fuel pump is fine, Please help!! Thanks,

Answer
Shaina,

Sounds like the headgasket replacement did not work and either the block is warped or the replacement heads are bad.  If you took it to a dealer take it back and address your concerns to them.  They have been paid to correct the problem and they have charged accordingly.  Have them pick it up for free and fix it.  The black stuff coming out of the exhaust is either water or oil.  Neither should come out the exhaust.