[DiveMikey]

I'm sure this is a common problem...

I own a 2001 Plymouth Neon, 96,000 miles.

When I start my engine cold, it's as smooth as glass. But when it gets to normal operating temperature, I have a rough idle at stop lights. When I shift from Drive to Neutral, the rough idle stops. When I shift from Neutral back to Drive, the engine still runs smooth.

Now here is what has been replaced new in the last 2,000 miles:

Spark Plugs
PCV Valve
O2 Sensors, downstream and upstream

Repair history shows that the following were repaired/replaced in the last year:

Engine Mounts
Belts

I think it's really strange that the engine stays smooth when going back to Drive from Neutral, AND that the car is smoother when it's cold. Do these factors help point to a specific problem?

Thanks for your help.

Mike