I recently had a new timing belt, tensioner, and water pump replaced on my 2001 Neon.

It was discovered that 2 motor mounts were shot, so I had them replaced.

It idles much more rough now (vibration transferred to the car instead of bouncing around on a broken rubber mount). I also changed the plugs and wires, but no difference. There are no codes being thrown.

It does not matter if the a/c is on or not. It does mellow a bit if I put it in park or neutral.

I have searched and read many things online about NEON’s and their rough idle, but I have not yet found an adequate answer or fix (if there is such a thing) for this.

There are many theories, ideas, and folklore out there, but nowhere could I find an actual “Hey, I did this and now it’s back to normal!”

So my question: Who has had a neon rough idle (as described) and was actually able to fix it?

I can live with it, but it would be better if it was a smoother experience when sitting in traffic.

Thanks!

Eightlitermopar