Mountain Bike Chain/Gear Question?

Gideon

New member
I have a Shwinn Hera 2005, and im gettting a new Kona Coilair
On my hera, when i push hard on the pedals, even with very little resistance(hills) my chain or the thing with all the sprockets on them in skipping, i dont think its my chain but does anyone no what it is and who to fix it?
Thanks
 
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