2003 Dodge Neon rough running help!

If the cam sensor you replaced wasn't OEM from Dodge send it back and buy one from the dealer. Not much price difference and you know you're getting a good one. I had one bite me before that was doing the same thing. There's also the pickup magnet on the end of the camshaft that the sensor picks up. I've only ever seen one bad, but there is allot of talk online about them having issues. You should have codes if either of those are your problem though.
-Jon