chevy aveo stalling

recently my 2005 chevy aveo started revving
really high when i start it. even when i hit the
gas real quick and let off, which normally
gets it to rev down, it keeps revving high
upon starting.  seemed to run well
otherwise. now it has stopped revving high
when it starts but has started dying out
after i put it in drive. any ideas? seems like
this year has been bas car wise with thia
thing. since i bought it, the only real issue i
had was having to replace the button under
the gas pedal that kept putting it  in hold.
that was it. one time. no other mechanical
problems
any ideas?