sputters when accelerating - idles ok on 2000 Plymouth Neon

car sputters when accelerating but idles ok and runs ok once get up to speed

Sputtering on acceleration is usually ignition or fuel system related. Is there a Check Engine/ Service Engine Soon light on? If so connecting a scan tool to the diagnostic socket under the dash will show fuel trim figures if it is running lean for fuel or may show cylinder misfire count if the ignition is failing.