I have a 2003 Neon with around 40,000 miles on it. It just started a sporatic miss while sitting still like at a red light with the a/c on, I do not notice the issue with the a/c off. Runs good when it get above an idle, do not notice anything driving down the road.
DLW

 

Maintenance history?

 

I bought the car from a Dodge dealer last summer with 30,000 miles on it (carfax confirmed) I have since only changed the oil and filters. Did change the tranny filter and oil because it ha an oil leak a couple of months ago. nothing other than that.

 

I'd start with a tune up then.

 

replaced the plugs and wow the miss cleared up. found the #2 plug a little loose with some engine oil around the top of the threads.
really did not think a bad plug would miss at just an idle.

 

The waste-spark ignition system the Neon's have can be quite finicky at times, especially when it comes to plugs and wires.

 

what do you mean by the "waste" spark system?

 

Internet.

http://en.m.wikipedia.org/wiki/Wasted_spark