1997 Geo Tracker

Engine Mechanical problem
1997 Geo Tracker 4 cyl Automatic 190k miles

My car doesn't do anything when I turn the key. The battery work because all the lights will come on but when I turn the ignition, it doesn't do anything. No clicks, no nothing. I recently dicovered a hissing sound when someone else tried to start it coming from underneath the hood. Some people say it's the starter but I'm not sure if it is. I previously had to literally floor it to get it up a hill and could never let it idol or it would go dead. However, when I pressed the gas all the way down, the car felt like it wasn't even trying. I could barely go 40 up a small hill. Can someone tell me why it won't start?
May 29, 2009.

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