I have a 1997 Dodge Ram 1500 with the 5.2L V8 and automatic
transmission.  I've noticed some strange idle problems that I need
some advice on.

My initial symptoms went like this:

Start the truck in the morning (cold) and put it in reverse.  IDLE
goes to about 1500 rpm.

When the AC is on the idle is high (1500 rpm) whenever the compressor
cycles on.  If I turn the AC off the RPM returns to normal.

When I rev the motor it's return to idle isn't smooth - it seems to
hang at certain spots on it's way down.

This weekend I pulled the air filter box and noticed a small piece of
rubber vacuum line on the front of the throttle body that was rotten
and leaking badly.  I replaced the hose and without the AC on things
seem to be better, but I still have this RPM elevation when the AC
compressor comes on.

Any advice would be appreciated.

Mark.

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