My 2002 Dodge Neon had trouble yesterday, running as if it had water in the fuel line. It would run very roughly, nearly stalling, then run more smoothly, alternativing. (The day was snowy and very wet, very damp.) Last night and today it seems to run smoothly, but the "check engine" light is on and it makes a "ding" sound every few minutes.

CHECK ALL OTHER DASH LIGHTS,MAKE SURE THE OIL PRESSURE IS GOOD,AND THE TEMP,AND BATTERY VOLTAGE,BETTER YET,CHECK THE ALTERNATOR OUT PUTIt should read 13.65 volts,to 14.25 volts with engine running,and headlights on,and high blower motor.The ding is a warning,if all this checks out,have the codes read to see if it will narrow the problem down.Auto zone can do this for free.There maybe moister in the fuel,try an additive called heet.