Toyota: 89 Camry--rough idle

Steve Neu wrote: 

Your car and every other FOUR cylinder automatic ever made does the
same thing to a greater or lesser degree at low engine RPMs
especially under load (in gear). Mounting the engine transversely
makes low RPM shuddering more noticeable than a longitudinal
mounting. The closer you can get the crank pin throws, the smoother
the engine will perform at idle under load. In this respect, the
only engine configuration that would produce more vibration would be
a single cylinder engine.
--

~~Philip

"Never let school interfere
with your education - Mark Twain"

In article <3vz2b.3083$news.pas.earthlink.net>,
Philip® <net> wrote: 

I know what you are talking about but this is worse than normal. When
its in gear with the AC on the RPMs are low enough the engine actually
knocks at idle when hot. More throttle or setting the idle up does not
seem to stop the knocking and rough running. It acts like the stall
speed of the torque converter is too low or the AC compressor is too
much load for the engine.

Steve