2001 Sentra 1.8 starts OK but as soon as you give it gas it bogs down If I feather the gas it sems to do better It's getting worse and I can't go up hills now no power Any suggestions?

Sounds like an air flow sensor in the intake manifold but this may me caused by other things. Have someone scan your car's computer for sensor errors. Many of the auto parts places will do this for free and give you a price for the part. However, if the scan shows the air flow sensor this part may have to be gotten from a Nissan dealer.