I noticed something today while driving. It's done this since I have owned the car. A few months. When you are at a stop light the rpm drops from 700 to 500 and the car shakes. If I just nudge the steering wheel an inch or so in either direction the rpm goes back up to 700 rpm and stays there. I did replace the switch in the steering rack because it was bad. I'm wondering if the engine idle solenoid could be bad. I have replaced all my mounts. Any thoughts?

 

What engine? How many miles? Last tune up? Automatic or manual?

 

2.0 sxt. 107,000 miles. New plugs and wires 2,000 miles ago. New water pump and timing belt also that time. Automatic. New power steering rack switch along with oil pressure switch.

 

Hey man, could it possibly be the Inlet Air Control/IAC Valve? My neon had a "surging" fit a while back and I replaced that as well as the Throttle Body Position/TBP Sensor. Car ran like a champ after until 200 miles later the timing belt broke.... Hope this helps!