I have a 2001 Ford Escape, v6. It has been a good vehicle but it is getting up there in its miles. The milage is currently at 93K.
Lately, the vehicle has developed a problem where it starts shaking like crazy if the idle is too low and the AC is on. You can normally compensate for this by hitting the gas a little bit, but this doesn't really work when stopped in traffic or making a slow turn.
The problem was not evident during the winter when the weather was cool, but since the spring has arrived the problem has popped up.
I had a similar issue last fall where the car would shake and shudder when cold started in the morning. That problem was corrected by servicing/cleaning the Air Intake System and also replacing the Idle Air Control valve.
The current problem is a lot rougher and more pronounced, as it only happens with the AC running.