My Pontiac has trouble making it up hills. Rattles, low power, help

What is your question?

My 1994 Pontiac 2 door coup rattles at start and for the first 20 mph has. Ill have my pedal to the floor and seems to have no power until it feels like it wants too.....having trouble going up hills have to get a head start b4 the hill no check engine light on break light was on for a while comes on randomly. Seems like it gets hot to fast no leaks that I see of any ideas? Sorry my grammar is bad and my punctuation :)