My camry is model LE, 4-cyl, 2.2L 1995.
It has about 215 thousand miles...

I have no problems with starting cold, no
problems with running/idling when the engine
is hot, at the normal working temperature.

However, when I finish a long trip, turn
off the engine, let it cool down a little
for 10 minutes and then restart the engine
I have problem idling. The rpms are low, in
the range of 500's and engine shakes a lot.

When I rev up couple of times and drive a mile
or two to make it warmer againe, everything
goes back to normal... rpms are back to 800.

Any troubleshooting ideas in such a scenario?