Sometimes it runs great, other times it idles rough and acceleration has little power. What can I do??

vacum leak or bad mass air flow meter

this sounds like gas i hade 2 cars that was doing this theres so much low grade gas out there and it come from driveing with little gas in car all the time go to the gas station filll up with top grade gas then get fuel injection cleaner and gas treatment pour the fuelinjection drive the car to 1/2 a tank the addd other 1 and fill up again with top grade again if this works u no whats going on